For a long time, I didn't get why hate was directed at Facebook for stuff like this. Come to find out, that's because I use it to keep in touch with a small circle of friends who are a bit too old for "zombie werewolves vs. ninja vampires." I saw some teens using it at the library, and their pages were wall to wall viral stuff like that.
Their API is pretty neat, though, and there are some modules for interfacing with it over at CPAN. I'd like to see some real widgets made, beyond the viral crap.
Edit: Is it a bad sign that I can't stop my mind from parsing the node title as un-tie (like untie $this_tied_thing) instead of unite?