Website: Reddit

Snoo, the time-traveling alien mascot of Reddit
"The front page of the internet"
—Reddit's Motto

Reddit is a very large news aggregator similar to Digg or Its structure is based around "subreddits", separate topic-specific aggregators which can be easily created. Although it isn't a wiki, The Wiki Rule is in full effect here, since subreddits can be (and are) made for pretty much anything. And yes, there's a TV Tropes subreddit.

Reddit is proven to be actually more addictive than TV Tropes. Don't believe us? Here, try it for yourself, but don't say we didn't warn you.

Reddit provides examples of the following tropes: