Dmitry Medvedev's Twitter feed featured posts stating he had resigned and was ashamed of the government.
OkCupid, a top U.S. matchmaking website, intentionally mismatched users to test its technology.
Acquired start-up that helps firms place more relevant ads in the videos on their websites and apps.
Regulator probing whether Facebook broke data protection laws when it conducted study on users.
Former marketing VP alleges sexual harassment and discrimination at the popular dating-app company.
Test saw Facebook "manipulate" news feeds to control which emotional expressions the users were exposed to.
Known as Slingshot, the app's features include sharing photos and videos, and sending "reaction shots."
The photo-sharing service plans to expand ads to the U.K., Canada and Australia later this year.
Turkey has lifted its ban on YouTube, two months after blocking access to the video-sharing site.
Company's latest move to give prominence to media and entertainment on its social network.
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