Dick Costolo is stepping down as chief executive of Twitter, the company has announced.
The social network's co-founder Jack Dorsey will take over as interim chief on 1 July and stay until a replacement can be found, it added.
Twitter's board has formed a committee to undertake the task of finding a successor.
Mr Costolo said he was "tremendously proud of the Twitter team" in the statement.
In April, the firm missed Wall Street's forecasts for revenue growth and posted a net loss of $162m (£104m).
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