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Last.fm, the online music service, has become the latest website to warn its users about a possible password leak.
The warning follows security breaches at professional social network LinkedIn and eHarmony, the dating website.
Social network site LinkedIn has confirmed that some 6.4 million password have been released onto the internet.
Hackers have posted a file containing the encrypted passwords onto a Russian web forum, and have invited the hacker community to help with the decryption.