Twitter has reported financial results which fell below expectations.
The social networking site's revenues were $436 million, well below forecast, and it made a net loss of $162m, which was worse than last year.
Twitter warned the negative pressure on its revenue would continue for the rest of the financial year - and the firm's shares slumped 18% at the end of trading in the US on Tuesday.
Danny Cox of stockbroker Hargreaves Lansdown says it's not all bad news.
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