Check your recently liked FB pages!
I noticed tonight that there was a page that I supposedly "liked" among my new liked pages on my timeline. It was a Facebook Page of someone I didn't know. I noticed the page was only 3 hours old and already had well over 3k in likes! Plus I saw 18 of my friends also had supposedly liked this page (I'm assuming they really didn't).
Since I don't recall liking this FB page, I 'unliked' and now it no longer appears on my timeline.
It could be a result of "likejacking" — See here: http://www.readwriteweb.com/archives/likejacking_takes_off_on_facebook.php
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"Likejacking" Takes Off on Facebook
www.readwriteweb.com
Security researchers are warning of the newest Facebook threat, something they're calling "likejacking," a Facebook-enabled clickjacking attack that tricks users into clicking links that mark the clicked site as one of your Facebook "likes." These likes then show up on your profile and, of course, i...
http://www.readwriteweb.com/archives/likejacking_takes_off_on_facebook.php