Just three months after its flotation on the New York Stock Exchange, Twitter has reported a loss of $645m (£396m) for 2013.
The loss was expected by analysts, who reported that Twitter had experienced a slow growth in user numbers.
Twitter averaged 241 million monthly users in the last quarter of the year, a mere 3.8% up on the previous quarter.
Reports also suggested that users were refreshing their feeds less often, when timeline views were down by nearly 7%.
Nate Elliot, an analyst at research firm Forrester, said: "If you don't have an engaged user base, you don't have a business. They have got to do better on users, that is the entire story."
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