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.
Gimme Serendipity - Get personalized photo recommendations using our Machine Learning algorithm by rating and submitting photos you like!
SaidIt.net - Saidit.net - say your truth.
go-random.com - Go-Random is a random website search engine.
Tildes - A non-profit community site driven by its users' interests
The Bored Hoard - Sieve the web for cool websites you probably never knew existed. Supporting the smaller independent sites that Google ignores. All revealed in a weekly box delivered online every Friday.