The site said it had won more than $2B from scam artists who sold fake likes to businesses.
Investment in mobile messaging service may value the start-up at about $10B, reports say.
Ad-free social media platform Ello overcomes a technical setback to continue its rapid growth.
Tens of millions have made China Apple's third-largest market for software sales.
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.
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