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.

Server Fault - Server Fault is a Q&A site for system administrators and IT professionals that's free.

Stack Exchange - Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse...

Steemit - Steemit is a social media platform where everyone gets paid for creating and curating content. It leverages a robust digital points system (Steem) for digital rewards.

MetaFilter - Community weblog

Poal.co - A free speech based link and comment aggregation platform.