Forgotten doesn't exactly mean "unliked" though. Unless whatever pages I hit "like" on in some situation make lots of noise, my "like"s are near-permanent - I probably won't even remember it's there. If they do make noise, it really needs to be enough to be seriously annoying before I bother unliking.

Of course, I didn't like his page, but I'm probably not that atypical. A lot of people use facebook once in a great while and make almost no effort to keep their page up to date, reflective of current friends, etc.