More than one billion people use Facebook's Messenger app to communicate every month. Now the social juggernaut is going after the younger audience. On Monday, it announced Messenger Kids, a standalone mobile app designed for children age 13 and under. From a report: The app, Messenger Kids, is a messaging service that gives parents authority over who their kids can chat with. Once a parent adds someone to their child's contact list through the main Facebook app, kids can video chat as well as send photos, videos, and texts, or pick something from "a library of kid-appropriate and specially chosen GIFs, frames, stickers, masks, and drawing tools," according to Facebook's announcement post. [...] A Facebook spokesperson said in an email to Gizmodo, "We've built automated systems that can detect things like nudity, violence, and child exploitative imagery to help limit that content from being shared on Messenger Kids. We also have blocking and reporting mechanisms, and have a dedicated team of human reviewers that review all content that is reported."