Clickjack

http://nakedsecurity.sophos.com/2011/03/12/what-is-foutube-viral-facebook-clickjacking-video-scams-explored/

Viral scams are spreading rapidly across Facebook, tricking unsuspecting users into saying they "Like" a page, which helps the links spread far and wide. The scams use a technique called clickjacking, often called "Likejacking" when it happens on Facebook. Typically you are presented with a realistic-looking video player, but clicking anywhere on the screen with your mouse actually triggers an invisible Facebook Like of the content.

Remember that often liking a page will give that page permission to post to your Facebook stream…