Facebook

Yech. Boring. Selfindulgent. Juvenile.
Getalife.
Ok, it's as boring as Second Life, maybe getabrain.
Maybe it's a sign of my advanced age, but ego-driven social sites don't turn me on, and I can't see much use for them in any library. Add them to the whack-a-mole collection - amusing for 30 seconds or less, if it's a slow day.