We’ve long speculated as to when Facebook might get its own version of Twitter’s retweet, and it appears that the time is now. This evening, the site rolled out a “via” feature that lets you repost another user’s shared items, with a “via” link attached for attribution.
It appears the feature is live for everyone. To try it, just go to a friend’s posted item in your news feed, click “share,” and you’ll see a “via [your friend’s name]” (with an option to remove it). Once shared, the item will appear on your profile, with a via link that points to your friend’s profile. Your friends will also see the item in their News Feeds, creating the viral loop that is the Twitter retweet.
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http://mashable.com/2010/01/16/facebook-via/