An anonymous reader quotes a report from TechCrunch: As U.S. lawmakers move forward with their plans for a TikTok ban or forced sale, the app's Chinese parent company ByteDance is driving another of its social platforms into the Top Charts of the U.S. App Store. ByteDance-owned app Lemon8, an Instagram rival that describes itself as a "lifestyle community," jumped into the U.S. App Store's Top Charts on Monday, becoming the No. 10 Overall app, across both apps and games. Today, it's ranked No. 9 on the App Store's Top Apps chart, excluding games. This is a dramatic move for the little-known app and one that points to paid user acquisition efforts powering this surge. Prior to yesterday, the Lemon8 app had never before ranked in the Top 200 Overall Charts in the U.S., according to app store intelligence provided to TechCrunch by data.ai.

The firm confirms that such a fast move from being an unranked app to being No. 9 among the top free apps in the U.S. -- ahead of YouTube, WhatsApp, Gmail and Facebook -- implies a "significant" and "recent" user acquisition push on the app publisher's part. Unfortunately, because the app is so new to the App Store's Top Charts, third-party app analytics firms don't yet have precise data on Lemon8's U.S. installs, or how those installs have recently changed over the past few days. [...] According to app intelligence provider Apptopia's data, Lemon8 debuted on both iOS and Android in March 2020 and has since gained 16 million global downloads, with Japan as its top market, accounting for 38% of its total installs. While the firm also doesn't have a figure for its U.S. installs, it was able to estimate the app currently has 4.25 million monthly active users. TechCrunch believes ByteDance may be leveraging TikTok to drive app installs of Lemon8. "Over on TikTok, we noticed a number of creators recently began posting about Lemon8, with many new videos appearing in just the past 24 hours," reports TechCrunch. "Concerningly, many of their reviews are extremely positive but are not marked as sponsored content. [...] In fact, some creators even said they're getting the app in case TikTok gets banned."

Meta on Friday launched its subscription service in the U.S., which would allow Facebook and Instagram users pay for verification in the same vein as Elon Musk-owned Twitter. From a report: The Meta Verified service will give users a blue badge after they verify their accounts using a government ID and will cost $11.99 per month on the web or $14.99 a month on Apple's iOS system and Google-owned Android, Meta said in a statement. The service, which Meta said it was testing in February, follows in the footsteps of Snapchat as well as messaging app Telegram and marks the latest effort by a social media company to diversify its revenue away from advertising.

Apple is launching a new music streaming service focused on classical music. TechCrunch reports: Based on its 2021 acquisition of Amsterdam-based streamer Primephonic, the new Apple Music Classical app will offer Apple Music subscribers access to more than 5 million classical music tracks, including new releases in high-quality audio, as well as hundreds of curated playlists, thousands of exclusive albums and other features like composer bios and deep dives on key works, Apple says.

However, while the app is being announced today, it's only available for preorder on the App Store for now. The release date will be later this month, on March 28. In addition, the app will only support iOS devices running iOS 15.4 or newer at launch. Apple Music Classical will present a simple interface for engaging with classical works. Users will be able to search by composer, work, conductor or even catalog number, to locate recordings. These can be streamed in high-quality audio of up to 192 kHz/24-bit Hi-Res Lossless. And thousands of recordings will be available in Apple's immersive spatial audio, as well.

The app will also let users dive into the recordings to read editorial notes about the composers and descriptions of their key works. Famous composers will have their own high-resolution digital portraits available, which Apple commissioned from artists. These were designed with color palettes and artistic references from the relevant classical period, Apple notes, and more will be added in time. At launch, portraits will be available for Ludwig van Beethoven, Frederic Chopin and Johann Sebastian Bach. The service will continue to be updated with new music over time, too. There's no additional charge for Apple Music Classical if you're an Apple Music subscriber. Android support is coming "soon."

Microsoft "is adding iPhone support to its Phone Link app on Windows 11," reports MacRumors. "The app allows iPhone users to make and receive phone calls, send and receive text messages, and view an iPhone's notifications directly on a PC." Notably, the app brings limited iMessage functionality to Windows. After pairing an iPhone with a PC via Bluetooth and granting some permissions on the iPhone, users can send and receive iMessages and SMS text messages in Phone Link, but there is no support for group chats or sending photos and videos.
The Verge notes you won't see the full message history in conversations, "as only messages that have been sent or received using Phone Link will be displayed." Microsoft isn't using blue or green bubbles in Phone Link either, as the company isn't able to differentiate between a standard text message and one sent via iMessage. The Phone Link integration for iOS is basic compared to what's available for Android, but Microsoft has never supported messaging or calls for iPhone users before, so this is a step in the right direction....

This new Phone Link support arrives alongside a big new Windows 11 update that includes AI-powered Bing on the taskbar, a screen recording feature, better touch optimizations, and more. If you're interested in testing this new Phone Link support for iOS, it will be available for Windows Insiders in the Dev, Beta, and Release Preview channels, but Microsoft is kicking off testing with a "small percentage" of testers this week.
Thanks to ttyler (Slashdot reader #20,687) for sharing the news.

Google has begun the process of bringing Chrome's full Blink browser engine to iOS against current App Store rules, and now we have our first look at the test browser in action. 9to5Google reports: In the weeks since the project was announced, Google (and Igalia, a major open source consultancy and frequent Chromium contributor) have been hard at work getting a simplified "content_shell" browser up and running in iOS and fixing issues along the way. As part of that bug fixing process, some developers have even shared screenshots of the minimal Blink-based browser running on an iPhone 12. In the images, we can see a few examples of Google Search working as expected, with no glaringly obvious issues in the site's appearance. Above the page contents, you can see a simple blue bar containing the address bar and typical browser controls like back, forward, and refresh.

With a significant bit of effort, we were able to build the prototype browser for ourselves and show other sites including 9to5Google running in Blink for iOS, through the Xcode Simulator. As an extra touch of detail, we now know what the three-dots button next to the address bar is for. It opens a menu with a "Begin tracing" button, to aid performance testing. From these work-in-progress screenshots, it seems clear that the Blink for iOS project is already making significant progress, but it's clearly a prototype not meant to be used like a full web browser. The next biggest step that Google has laid out is to ensure this version of Blink/Chromium for iOS passes all of the many tests that ensure all aspects of a browser are working correctly.

Bluesky, the Twitter alternative backed by Twitter co-founder and CEO Jack Dorsey, has hit the App Store and more testers are gaining access. Though the app is still only available as an invite-only beta, its App Store arrival signals that a public launch could be nearing. TechCrunch reports: We haven't heard much from Bluesky since October 2022, when the team behind the project shared an update on the Bluesky blog, detailing the status of the social protocol that powers its new Twitter-like app, also called Bluesky. AT (originally called ADX, or "Authenticated Transfer Protocol,") is Bluesky's main effort while the Bluesky mobile app serves to showcase the protocol in action. [...]

We received an invite to the service and found it to be a functional, if still rather bare-bones, Twitter-like experience. Users create a handle which is then represented as @username.bsky.social as well as the display name that appears more prominently in bold text, as on Twitter. As a brand-new app, Bluesky's suggested user list didn't immediately impress with big names of public figures during onboarding. The app itself presents a simplified user interface where you can click a plus button to create a post of 256 characters, which can include photos. Where Twitter asks "What's happening?," Bluesky asks "What's up?" You can search for and follow other individuals, much like on Twitter, then view their updates in a Home timeline. User profiles contain the same sort of features you'd expect: a profile pic, background, bio and metrics, like the number of followers and posts a user has, as well as how many people they're following. Profile feeds are also divided into two sections, like Twitter: posts and posts & replies.

Bluesky users can share, mute and block accounts, but advanced tools, like adding them to lists, are not yet available. The discover tab in the bottom center of the app's navigation is useful, offering more "who to follow" suggestions and a running feed of recently posted Bluesky updates. The latter gives you the opportunity to find more people who you might like to follow, based on their posts rather than just a bio. Posts themselves can be replied to, retweeted, liked and, from a three-dot menu, reported, shared via the iOS Share Sheet to other apps, or copied as text. Another tab lets you check on your Notifications, including likes, reposts, follows and replies, also much like Twitter. There are no DMs. You can download the app here, but you're still going to need an invite code.

Microsoft is releasing an update to Windows 11 today that adds the company's new AI-powered Bing search to the taskbar. From a report: The new Windows 11 update will offer quick access to the new Bing chat feature alongside a bunch of new features. Windows 11 is also getting improvements to widgets, a better touch mode, a screen recording feature, tabs inside Notepad, and more. The new Bing integration is a surprise addition that Microsoft hasn't been testing with its Windows Insiders. A new Bing icon will appear within the search box in the taskbar, with Microsoft highlighting the new chat answers experience in the search flyout. While chat answers won't be available directly within the search flyout, Windows 11 users will be able to quickly start a Bing chat in Edge from here -- providing they have access to the Bing preview. Microsoft is also opening up a preview of its Phone Link app for iOS, meaning iPhone users can link their devices to Windows. This will include access to send and receive messages (yes, even iMessage), calls, and notifications.

Since the earliest versions of the iPhone, "The ability to dynamically execute code was nearly completely removed," write security researchers at Trellix, "creating a powerful barrier for exploits which would need to find a way around these mitigations to run a malicious program. As macOS has continually adopted more features of iOS it has also come to enforce code signing more strictly.

"The Trellix Advanced Research Center vulnerability team has discovered a large new class of bugs that allow bypassing code signing to execute arbitrary code in the context of several platform applications, leading to escalation of privileges and sandbox escape on both macOS and iOS.... The vulnerabilities range from medium to high severity with CVSS scores between 5.1 and 7.1. These issues could be used by malicious applications and exploits to gain access to sensitive information such as a user's messages, location data, call history, and photos."

Computer Weekly explains that the vulnerability bypasses strengthened code-signing mitigations put in place by Apple on its developer tool NSPredicate after the infamous ForcedEntry exploit used by Israeli spyware manufacturer NSO Group: So far, the team has found multiple vulnerabilities within the new class of bugs, the first and most significant of which exists in a process designed to catalogue data about behaviour on Apple devices. If an attacker has achieved code execution capability in a process with the right entitlements, they could then use NSPredicate to execute code with the process's full privilege, gaining access to the victim's data.

Emmitt and his team also found other issues that could enable attackers with appropriate privileges to install arbitrary applications on a victim's device, access and read sensitive information, and even wipe a victim's device. Ultimately, all of the new bugs carry a similar level of impact to ForcedEntry.

Senior vulnerability researcher Austin Emmitt said the vulnerabilities constituted a "significant breach" of the macOS and iOS security models, which rely on individual applications having fine-grain access to the subset of resources needed, and querying services with more privileges to get anything else.
"The key thing here is the vulnerabilities break Apple's security model at a fundamental level," Trellix's director of vulnerability research told Wired — though there's some additional context: Apple has fixed the bugs the company found, and there is no evidence they were exploited.... Crucially, any attacker trying to exploit these bugs would require an initial foothold into someone's device. They would need to have found a way in before being able to abuse the NSPredicate system. (The existence of a vulnerability doesn't mean that it has been exploited.)

Apple patched the NSPredicate vulnerabilities Trellix found in its macOS 13.2 and iOS 16.3 software updates, which were released in January. Apple has also issued CVEs for the vulnerabilities that were discovered: CVE-2023-23530 and CVE-2023-23531. Since Apple addressed these vulnerabilities, it has also released newer versions of macOS and iOS. These included security fixes for a bug that was being exploited on people's devices.
TechCrunch explores its severity: While Trellix has seen no evidence to suggest that these vulnerabilities have been actively exploited, the cybersecurity company tells TechCrunch that its research shows that iOS and macOS are "not inherently more secure" than other operating systems....

Will Strafach, a security researcher and founder of the Guardian firewall app, described the vulnerabilities as "pretty clever," but warned that there is little the average user can do about these threats, "besides staying vigilant about installing security updates." And iOS and macOS security researcher Wojciech ReguÅa told TechCrunch that while the vulnerabilities could be significant, in the absence of exploits, more details are needed to determine how big this attack surface is.

Jamf's Michael Covington said that Apple's code-signing measures were "never intended to be a silver bullet or a lone solution" for protecting device data. "The vulnerabilities, though noteworthy, show how layered defenses are so critical to maintaining good security posture," Covington said.

Back in the days before practically every mobile game was a free-to-play, ad- and microtransaction-laden sinkhole, Rovio found years of viral success selling paid downloads of Angry Birds to tens of millions of smartphone users. Today, though, the company is delisting the last "pay upfront" version of the game from mobile app stores because of what it says is a "negative impact" on the more lucrative free-to-play titles in the franchise. From a report: Years after its 2009 launch, the original Angry Birds was first pulled from mobile app stores in 2019, a move Rovio later blamed on "outdated game engines and design." The remastered "Rovio Classics" version of the original game launched last year, asking 99 cents for over 390 ad-free levels, complete with updated graphics and a new, future-proofed engine "built from the ground up in Unity." In a tweeted statement earlier this week, though, Rovio announced that it is delisting Rovio Classics: Angry Birds from the Google Play Store and renaming the game Red's First Flight on the iOS App Store (presumably to make it less findable in an "Angry Birds" search). That's because of the game's "impact on our wider games portfolio," Rovio said, including "live" titles such as Angry Birds 2, Angry Birds Friends, and Angry Birds Journey.

Google has announced that the Magic Eraser feature, which tried to automatically remove unwanted parts of a picture and debuted with the Pixel 6, will no longer be exclusive to phones with its custom chips. From a report: Starting on Thursday, it's going to be rolling out to Google One subscribers who use the Google Photos app on Android or iOS as well as "all Pixel users." Magic Eraser, as well as the "Camouflage" function that lets you desaturate potentially distracting background objects rather than erasing them from a picture completely, will come with any level of Google One plan. If you have a Pixel, you won't have to have a plan at all to get it. Google says it's also adding editing features like an HDR effect for videos and exclusive collage editor styles for Google One subscribers and Pixel users. Google says it could be a few weeks before everyone gets access to the new photo editing features.

Tumblr's parody of paid verification has already delivered the social network and blogging platform a 125% boost in iOS in-app purchase revenue since November, according to a new analysis of the app's in-app consumer spending. TechCrunch reports: The company, now operated by WordPress.com owner Automattic following its 2019 acquisition, launched its response to Twitter's paid verification hustle with the addition of its own purely cosmetic double blue checks -- a sort of tongue-in-cheek rebuttal to the idea that subscription-based verification had any real value. As it turns out, at least some Tumblr users were willing to pay -- though perhaps not for clout, but because in-jokes have proven to be a more successful monetization strategy for the blogging network than some of its more legitimate attempts to make money, such as its creator-focused subscription, Post+. After being met with community backlash, at one point Post+ was being outperformed from a monetization perspective by crabs -- a goofy paid feature that let users send animated dancing crabs to each other's dashboards.

According to new data from app intelligence firm Sensor Tower provided to TechCrunch, consumer spending on Tumblr's iOS app increased since November 2022's double-blue check launch, now totaling $263,000 in net revenue. While that's not a significant figure in the grand scheme of things by any means, it still represents a 125% jump in spending compared with the prior three-month total of August through October 2022. When looking at more long-term trends, Tumblr's revenue remains up -- but not by as much. Sensor Tower says the in-app purchase revenue on iOS is up 19%, compared with the prior ten months ahead of the blue check's launch (January through October 2022).

Long-time Slashdot reader destinyland writes: Meta announced a new $11.99-a-month subscription service on Sunday (or $14.99-a-month for Android and iOS). For your money you mainly get the privilege of authenticating your own account with a government ID, so that it can then display the official "verified" badge. (Accounts must have a prior posting history, with account holders verified to be at least 18 years old.)

Meta promises they won't change already-verified Facebook and Instagram accounts — at least, not "as we test and learn." But they immediately follow that sentence by warning that in the longer-term they're "evolving the meaning" of verification, aiming to making everyone want to subscribe. Meta calls this "expanding access."

Paying subscribers will also get:

— Protection from account impersonation (at a higher level that's apparently not made available to non-paying members), including "proactive account monitoring".

— "Help when you need it with access to a real person for common account issues."

— Exclusive "stickers" for Facebook and Instagram Stories and Facebook Reels, plus 100 free Facebook "stars" each month "so you can show your support for other creators."


But most importantly, Meta is also promising to grant "increased visibility and reach" to paying members, promising "prominence" in parts of the service (including search, recommendations, and in comments). Although a footnote warns this may vary — depending on what you're trying to post about — and all content "will be treated according to our existing guidelines for recommendations on Instagram or Facebook and our Content Guidelines."

George Takei once calculated roughly 80% of your friends never see the things you post on Facebook. But now Facebook is deliberately evolving into a two-tiered system where some will always be relegated to less-likely-to-be-seen status, always outshined by wealthier friends with $144 a year to spend on upgrading their Facebook accounts.

The internet already has a two-tiered system for news, where the best news articles are only available to those with the funds to climb over multiple paywalls. But now even the lower tier of discourse — all that non-journalistic content floating around Facebook — will transform from a pool of burbling anger and misinformation into something worse. It's like Facebook's algorithm went from promoting just the most divisive content to promoting content from whoever most desires to foist their ideas onto other people. This may not end well.

Is it just me, or does this seem like a desperate grab for money?

— They're monetizing Meta's inability to stop account impersonators.

— Their announcement admits that "access to account support" remains a top request of their creators. Yet paying members are apparently more likely to get it than non-paying members. Maybe that can be their new marketing slogan. "Help when you need it — sold separately."

— This is happening. It becomes available for purchase this week on Instagram or Facebook in Australia and New Zealand.

According to The Register, Google has been paying Apple a portion of search revenue generated by people using Google Chrome on iOS. From the report: This is one of the aspects of the relationship between the two tech goliaths that currently concerns the UK's Competition and Markets Authority (CMA). Though everyone knows Google pays Apple, Samsung, and other manufacturers billions of dollars to make its web search engine the default on devices, it has not been reported until now that the CMA has been looking into Chrome on iOS and its role in a search revenue sharing deal Google has with Apple. The British competition watchdog is worried that Google's payments to Apple discourage the iPhone maker from competing with Google. Substantial payments for doing nothing incentivize more of the same, it's argued. This perhaps explains why Apple, though hugely profitable, has not launched a rival search engine or invested in the development of its Safari browser to the point that it could become a credible challenger to Chrome.

Having Google pay Apple "a significant share of revenue from Google Search traffic" passing through its own Chrome browser on iOS is difficult to explain. Apple does not provide any obvious value to people seeking to use Google Search within Google Chrome. One attempt to explain the arrangement can be found in an antitrust lawsuit filed on December 27, 2021, and subsequently amended [PDF] on March 29, 2022. The complaint, filed by the Alioto Law Firm in San Francisco, claims Apple has been paid for the profits it would have made if it had competed with Google, without the cost and challenge of doing so. "Because more than half of Google's search business was conducted through Apple devices, Apple was a major potential threat to Google, and that threat was designated by Google as 'Code Red,'" the complaint contends. "Google paid billions of dollars to Apple and agreed to share its profits with Apple to eliminate the threat and fear of Apple as a competitor."

These alleged revenue sharing arrangements -- which are known in detail only to a limited number of people and have yet to be fully disclosed -- have been noted by the UK CMA as well as the US Justice Department, which along with eleven US States, filed an antitrust complaint against Google on October 20, 2020. Reached by phone, attorney Joseph M. Alioto, who filed the private antitrust lawsuit, told The Register it would not surprise him to learn that Google has been paying Apple for search revenue derived from Chrome. He said Google's deal with Apple, which began at $1 billion per year, reached as high as $15 billion annually in 2021. "The division of the market is per se illegal under the antitrust laws," said Alioto. Apple and Google are currently trying to have the case dismissed citing lack of evidence of a horizontal agreement between the two companies, and other supposed deficiencies.

Google has been paying Apple a portion of search revenue generated by people using Google Chrome on iOS, The Register reported Friday, citing a source. This is one of the aspects of the relationship between the two tech goliaths that currently concerns the UK's Competition and Markets Authority (CMA), the report added. From the report: Though everyone knows Google pays Apple, Samsung, and other manufacturers billions of dollars to make its web search engine the default on devices, it has not been reported until now that the CMA has been looking into Chrome on iOS and its role in a search revenue sharing deal Google has with Apple. We twice asked Apple and Google to confirm or deny what we've learned, and neither corporation would talk. We also approached the CMA, and a spokesperson for the monopoly regulator said: "The CMA cannot comment on or disclose any confidential information."

The Justice Department has ramped up work in recent months on drafting a potential antitrust complaint against Apple, WSJ reported Wednesday, citing people familiar with the matter. From the report: The investigation into whether Apple has monopoly power that it abuses began in 2019, but enforcers have escalated their efforts in recent months, with more litigators now assigned to the case and new requests for documents and consultations with companies involved, the people said. The Justice Department's investigation deals in part with Apple's policies governing mobile third-party software on its devices, which has been the focus of much of the criticism targeting Apple's competitive practices. The department is also looking at whether Apple's mobile operating system, iOS, operates in an anticompetitive way by favoring its own products over those of outside developers, the people said.

Mozilla is planning for the day when Apple will no longer require its competitors to use the WebKit browser engine in iOS. From a report: Mozilla conducted similar experiments that never went anywhere years ago but in October 2022 posted an issue in the GitHub repository housing the code for the iOS version of Firefox that includes a reference to GeckoView, a wrapper for Firefox's Gecko rendering engine. Under the current Apple App Store Guidelines, iOS browser apps must use WebKit. So a Firefox build incorporating Gecko rather than WebKit currently cannot be distributed through the iOS App Store.

As we reported last week, Mozilla is not alone in anticipating an iOS App Store regime that tolerates browser competition. Google has begun work on a Blink-based version of Chrome for iOS. The major browser makers -- Apple, Google, and Mozilla -- each have their own browser rendering engines. Apple's Safari is based on WebKit; Google's Chrome and its open source Chromium foundation is based on Blink (forked from WebKit a decade ago); and Mozilla's Firefox is based on Gecko. Microsoft developed its own Trident rendering engine in the outdated Internet Explorer and a Trident fork called EdgeHTML in legacy versions of Edge but has relied on Blink since rebasing its Edge browser on Chromium code.

Longtime Slashdot reader Dotnaught writes: "Google's Chromium developers have begun work on an experimental web browser for Apple's iOS using the search giant's Blink engine," reports The Register. "That's unexpected because the current version of Chrome for iOS uses Apple's WebKit rendering engine under the hood. Apple requires every iOS browser to use WebKit and its iOS App Store Review Guidelines state, 'Apps that browse the web must use the appropriate WebKit framework and WebKit Javascript.'"

Google insists this is an experiment and isn't intended for release. But the stripped-down, Blink-based browser could be preparation for European competition rules that look like they will require Apple to stop requiring that other browser makers use its WebKit engine. "This is an experimental prototype that we are developing as part of an open source project with the goal to understand certain aspects of performance on iOS," said a Google spokesperson. "It will not be available to users and we'll continue to abide by Apple's policies."

Password management company Dashlane has made its mobile app code available on GitHub for public perusal, a first step it says in a broader push to make its platform more transparent. TechCrunch reports: The Dashlane Android app code is available now alongside the iOS incarnation, though it also appears to include the codebase for its Apple Watch and Mac apps even though Dashlane hasn't specifically announced that. The company said that it eventually plans to make the code for its web extension available on GitHub too. Initially, Dashlane said that it was planning to make its codebase "fully open source," but in response to a handful of questions posed by TechCrunch, it appears that won't in fact be the case.

At first, the code will be open for auditing purposes only, but in the future it may start accepting contributions too --" however, there is no suggestion that it will go all-in and allow the public to fork or otherwise re-use the code in their own applications. Dashlane has released the code under a Creative Commons Attribution-NonCommercial 4.0 license, which technically means that users are allowed to copy, share and build upon the codebase so long as it's for non-commercial purposes. However, the company said that it has stripped out some key elements from its release, effectively hamstringing what third-party developers are able to do with the code. [...]

"The main benefit of making this code public is that anyone can audit the code and understand how we build the Dashlane mobile application," the company wrote. "Customers and the curious can also explore the algorithms and logic behind password management software in general. In addition, business customers, or those who may be interested, can better meet compliance requirements by being able to review our code." On top of that, the company says that a benefit of releasing its code is to perhaps draw-in technical talent, who can inspect the code prior to an interview and perhaps share some ideas on how things could be improved. Moreover, so-called "white-hat hackers" will now be better equipped to earn bug bounties. "Transparency and trust are part of our company values, and we strive to reflect those values in everything we do," Dashlane continued. "We hope that being transparent about our code base will increase the trust customers have in our product."

Nostr, a startup decentralized social network, got its Twitter-like Damus application listed on Apple's App Store. CoinDesk reports: Nostr is an open protocol that aims to create a censorship-resistant global social network. Media commentators have described it as a possible alternative to Elon Musk's Twitter. According to an article in Protos, Nostr is popular with bitcoiners partly because most implementations of it support payments over Bitcoin's Lightning Network.

Former Twitter CEO Jack Dorsey, who last year donated roughly 14 BTC (worth $245,000 at the time) to fund Nostr's development, hailed the debut of Damus on Apple's App Store as a "milestone for open protocols," in a tweet posted late Tuesday. As of press time, the tweet had been viewed 2.1 million times. According to the Nostr website, Damus is one of several Nostr projects, including Anigma, a Telegram-like chat; Nostros, a mobile client; and Jester, a chess application. You can download the iOS app here.

Kevin Systrom and Mike Krieger are back. From a report: The Instagram co-founders, who departed Facebook in 2018 amid tensions with their parent company, have formed a new venture to explore ideas for next-generation social apps. Their first product is Artifact, a personalized news feed that uses machine learning to understand your interests and will soon let you discuss those articles with friends. Artifact -- the name represents the merging of articles, facts, and artificial intelligence -- is opening up its waiting list to the public today. The company plans to let users in quickly, Systrom says. You can sign up yourself here; the app is available for both Android and iOS.

The simplest way to understand Artifact is as a kind of TikTok for text, though you might also call it Google Reader reborn as a mobile app, or maybe even a surprise attack on Twitter. The app opens to a feed of popular articles chosen from a curated list of publishers ranging from leading news organizations like the New York Times to small-scale blogs about niche topics. Tap on articles that interest you and Artifact will serve you similar posts and stories in the future, just as watching videos on TikTok's For You page tunes its algorithm over time.