http://www.urbandictionary.com/define.php?term=AOL&defid=2229148

Another way of saying "me too"; coined from the fondness of AOL (America Online) users for endlessly replying to bulleten board and forum messages with the phrase. AOL users got a reputation of having nothing useful or interesting to say, other than telling the world that whatever someone else had said, applied to them too.

–“I like cheese and bacon.”
–“aol”