Last month, Twitter hired bankers ahead of a possible sale, but bids from potential suitors such as Google and Salesforce failed to materialise.
Shares in Twitter fell 7% earlier this month after Salesforce - considered to be the most likely bidder - said it had walked away from talks.
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On Thursday afternoon Twitter said it would close the Vine video sharing service, which it bought four years ago, but gave no reason for the move.
Jack Dorsey, chief executive, said he saw a "significant opportunity to increase growth" as the company improved the platform.