Under fire for the worst privacy debacle in his company's history, Facebook CEO Mark Zuckerberg batted away often-aggressive questioning from lawmakers who accused him of failing to protect the personal information of millions of Americans from Russians intent on upsetting the U.S. election.

During some five hours of Senate questioning Tuesday, Zuckerberg apologized several times for Facebook failures, disclosed that his company was "working with" special counsel Robert Mueller in the federal probe of Russian election interference and said it was working hard to change its own operations after the harvesting of users' private data by a data-mining company affiliated with Donald Trump's campaign.

Some of the most popular music videos on YouTube including mega-hit "Despacito" momentarily disappeared Tuesday in an apparent hacking.

Lost amid a flurry of Facebook announcements about privacy settings and data access is a much more fundamental question: Is Facebook really changing its relationship with users, or just tinkering around the edges of a deeper problem — its insatiable appetite for the data it uses to sell ads?

The popular messaging app Telegram risks being blocked in Russia after refusing demands to hand over its encryption keys to give the FSB security service access to users' data.

Russia's telecoms watchdog on Friday asked a Moscow court to block the popular messaging app Telegram after the expiry of a deadline for it to give the state security services access to private conversations.

Facebook revealed Wednesday that tens of millions more people might have been exposed in the Cambridge Analytica privacy scandal than previously thought and said it will restrict the user data that outsiders can access.

Those developments came as congressional officials said CEO Mark Zuckerberg will testify next week, while Facebook unveiled a new privacy policy that aims to explain the data it gathers on users more clearly — but doesn't actually change what it collects and shares.

Spotify on Tuesday debuts as a publicly traded company, hoping that its streaming music model will be a hit with investors and a  boon to artists.

Gay dating app Grindr was under fire on Monday for sharing information about users' HIV status or locations with two companies enlisted to optimize its software.

Facebook will likely need "a few years" to fix the problems uncovered by the revelations on the hijacking of private user data, chief executive Mark Zuckerberg said in an interview released Monday.

There's an art to taking the perfect selfie -- from the angle, to the focus, cropping out that pesky outstretched arm and above all, the smile.

In a celebration of self-portraits in the social media age Tommy Honton and Tair Mamedov are set to open the Museum of Selfies in Los Angeles this Sunday -- an interactive exhibition exploring the history and cultural phenomenon of snapping a photo of yourself.