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A computer worm has stolen 45,000 login credentials from Facebook, security experts have warned.
The data is believed to have been taken largely from Facebook accounts in the UK and France, according to security firm Seculert.
The culprit is a well-known piece of malware - dubbed Ramnit - which has been around since April 2010 and has previously stolen banking details.
Facebook told the BBC that it was looking into the issue.