Facing a possible ban in Turkey, Facebook has complied with a court order, according to news reports.
Asking whether terrorists should be given safe spaces to talk, David Cameron pledges to tighten laws that could challenge WhatsApp and other messaging apps.
Twitter is removing the militant group's accounts as they crop up, citing such accounts as violations of its terms of service.
After banning dozens of accounts at the government's request, the social network recants and makes the content available again.
Ban on video-sharing site lifted five days after the country's highest court said the move violated freedom of expression.
The company has complied with requests from a Pakistani "bureaucrat" to hide specific content, says the New York Times.
Office of the Indian prime minister changes its Twitter handle and won't give access to newly elected PM Narendra Modi.
Wikipedia founder Jimmy Wales describes the European ruling as "wide-sweeping censorship" that "doesn't make sense."
Accounts linked to the spread of government corruption allegations appeared blocked less than a week after the social network agreed to shutter some accounts.
The ban has officially been lifted, a Turkish government official confirms to Reuters.