A Paris court has ruled that Twitter must make public the names of France-based users posting anti-Semitic messages, after the social media firm's appeal was not considered.
At the start of the year the Paris High Court told the company to pass on the data to France's Union of Jewish Students (UEJF) and other groups which had allegedly spotted racist tweets.
Twitter blocked the messages in France, but appealed against the decision to reveal user identification.
The firm is still to make public any of the requested identities and has not ruled out another appeal.
A spokesperson said: "We are disappointed that the court has decided not to hear our appeal. We are considering our options, including resubmitting the appeal."
Earlier this week, an appeals court in Paris ruled that Twitter had not offered a good enough reason to withhold users' details.
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