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Twitter's decision to open a UK office could leave it more vulnerable to prosecution over what its users write.
Lawyers who spoke to the BBC agreed that the move meant the company may no longer be able to claim to be solely US-based and immune to English law.
The micro-blogging site is the subject of a High Court legal challenge in relation to the naming of a footballer who had obtained a privacy injunction.
Twitter has so far declined to comment on the case.
Until recently, Twitter's operations were largely confined to Silicon Valley in California.
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