Facebook battles Koobface worm

SAN FRANCISCO

The virus, called Koobface, disguises itself as a message from a friend, with a link to a video site.

If users try to click on the movie, a message tells them to download the latest version of flash player, but the download is actually a virus.

Facebook is asking users to delete contaminated e-mails, and has posted directions on how to clean infected computers.

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