This site is also awesome. Think facebook but geo-locked. You have to sign up with your address, but you can see your neighbors and who lives where. The farther away you get from someone, the less you can see about them. I could see all your info if you live 1 street over, but if you are in the next neighborhood I only see that you live in your neighborhood. Pretty cool for all of the local stuff without the stupid memes, jokes, etc.
http://www.nextdoor.com