I think the use of the word "like" in the context of Facebook is in most cases as ludicrous as Myspace's use of "friends".
When my band used Myspace, we'd get endless requests from idiots with 5 gazillion "friends", who had no interest in us or our type of music and just wanted to boost their number of "friends". The only "relationship" we'd ever have with our new found "friend" would be clicking the accept button (or in our case the "up yours, clown!" reject button) in answer to their request. Once that was done, they'd be off to find another new "friend", never to darken our page with their shallow and desperately needy personality again.
We did meet some great bands and people, but they were very much in the minority amongst a tidal wave of losers who seem to view the whole social media thing as a game of top trumps, which if they win somehow proves someone out there actually likes them.