Issies microblogging website's settings may have used data for personalised ads without a user's permission, said Twitter, adding they might have also include users’ engagement details with a particular ad.
Twitter registers drop in market value by more than $6 billion as it begins containing online hate and trolls that has in turn hurt its standing with investors and declined its monthly users.
The microblogging website ran a test on 280-character tweets in September, showing that users spent less time editing their tweets and were less likely to abandon them.
Turkish citizens are heading to the polls on Sunday to decide whether their parliamentary system should change to a presidential one. Supporters of both sides of the argument have been active on Twitter.
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