Snapzu - Snapzu is basically reddit alternative.
Empeopled - Empeopled is a content-sharing community that
4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.
DonationCoder - A site for software connoisseurs - featuring the best freeware, donationware, software reviews, and discussions.
Digg - Digg delivers the most interesting and talked-about stories on the Web right now.
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.