We already have an FB group, but the issue is that information (who the committee is, who does what, how much it is to join, previous events, etc) is really hard to put on there in a visible form - wall posts eventually get buried, “group info” has been relegated to a small box in the corner, and such. As for a "like"able page where some of those things are easier to do, I believe you lose the ability to restrict certain things to members only (only "like"rs only, and anyone can like).
There was also some talk of a forum (phpBB is fine as far as I can see, though I might be a bit out of date in that view), as again wall discussions end up getting buried and are quite unwieldy. I’m somewhat undecided on it though, I’m not sure how much use it would actually see.