My favorite sites are all hobby related sites I'm currently involved in, which are general cooking, grilling/bbq/smoking, hiking, and cycling. I also visit a couple of fetish sites but I wouldn't consider them "favorites" but do visit them often.
For socializing, this is it. Second would be Amazon, because I love to read, read to some very educated women aloud, and don't mind if the books are second-hand. PLUS, I live in a small community and often shop through Amazon. I've tried to find a site on old home living (mine is 160 years old), but never found one as easy to use as DC.