wow, lots of FB hate here.
I like FB. I use it a lot. I'm not looking for attention, and I don't need the ego boost. I just find it entertaining and interesting. I have a lot of hobbies, and a lot of interests. FB feeds them all at once, and with tremendous variety. When I load my feed, I get to see interesting RC-related stuff, firearm stuff, Camaro stuff, guitar stuff, and oodles of politics all at once without needing to seek it out. When something catches my eye, I click on it, and off I go.
I have no expectation that it'll replace my favorite forums for knowledge building and serious research, but that doesn't mean it doesn't serve a useful role in my daily dose of useless knowledge gathering.