To Facebook or Not To Facebook?

So my dear Molly has joined Facebook.  I don't know much about it.  I used to think all technology was evil, but if Molly would do it, it can't be all bad.  (Although she DID have that run-in with the music of the Grateful Dead -- seriously, I guarantee THOSE people won't be grateful when they're dead!)  So anyway, I'm wondering if I should join Facebook too.  What do you all think?