An official Twitter account for the company's chief financial officer unleashed a barrage of spam posts on Tuesday in what may have been a hack or a glitch.
Newsweek's Twitter feed was briefly hijacked Tuesday by hackers who displayed messages supporting the Islamic State group.
Twitter said Monday it saw a 40 percent jump in government request for user data in late 2014, with sharp rises coming from both Turkey and Russia.
Twitter is stepping up efforts to boost its user base and monetization as the messaging platform faces pressure from lackluster growth since its stock market splash debut in late 2013.
Twitter has reached a deal with Google to make its short messages more visible on the Internet, Bloomberg said Thursday.
Twitter unveiled plans Tuesday to sell ads that run outside its own platform in what could be the start of a broader advertising network.
The fight against Islamic State jihadists is taking place online as well on the battlefield, with 18,000 Twitter accounts linked to the group suspended in recent months, according to a US expert.
Twitter on Tuesday began rolling out new group chat and video features as it worked to ramp up use of the one-to-many messaging service.
Twitter is updating its feeds to give users a recap of tweets missed while not connected to the messaging platform.