I think the most important thing that facebook is going to do for humanity in general and the United States in particular, as a society, is inform us which of our friends/relatives/acquaintances are fucking idiots that we really should not associate with at all.
This maps closely to another quote, the specifics and citation for which I’ve lost, to the effect of “Twitter makes me want to buy drinks for people I don’t know, and Facebook makes me want to punch my friends and family.”