An app launched by Samaritans notifies Twitter users if people they follow seem to be distressed.
Timeline views per user, a key measure of user engagement, dropped 7% in Q3.
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.
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