Twitter has posted its weakest quarterly revenue growth since its stock market flotation in 2013, with shares plunging 10% on opening in New York.
The microblogging service, which has never made a profit, reported a 1% rise in fourth-quarter revenue to $717m (£571m).
The figure failed to meet market expectations of £740m for the three-month period.
Twitter said its annual net loss had eased to $457m (£364m) from $521m the year before, despite quarterly losses widening.
It also warned that underlying profitability would take a hit in 2017 because revenue growth would continue to lag user growth amid stiff competition for advertising spending… see more