Roughly two-thirds of the world's internet users live under regimes of government censorship, according to a report from Freedom House, a pro-democracy think tank. The report adds that internet freedom declined worldwide for a sixth consecutive year in 2016 with the governments increasingly crack down on social media services and messaging apps. From a report on NPR: "In a new development, the most routinely targeted tools this year were instant messaging and calling platforms, with restrictions often imposed during times of protests or due to national security concerns," the report says. WhatsApp emerged as the most-blocked app, facing restrictions in 12 of the 65 studied countries. The report's scope covers the experiences of some 88 percent of the world's Internet users. And of all 65 countries reviewed, Internet freedom in 34 -- more than half -- has been on a decline over the past year. Particular downturns were marked in Uganda, Bangladesh, Cambodia, Ecuador and Libya. Facebook users were arrested in 27 countries, more than any other app or platform. And such arrests are spreading. Since June of last year, police in 38 countries have arrested people for what they said on social media -- surpassing even the 21 countries, where people were arrested for what they published on more traditional platforms like blogs and news sites. "Some supposed offenses were quite petty, illustrating both the sensitivity of some regimes and the broad discretion given to police and prosecutors under applicable laws," the report says.