Check out Digg.com sometime. It is basically like youtubes most viewed video section but instead of only categorizing videos it also has images, articles, stories, games and anything that is of interest on the net. What it does with this viral media is let the users rate whether they dugg the it or not. If you dugg the media, it gets one vote.
The more votes a piece of media gets the higher the rating and the more people get to see it. You can also look at the best in the past 24 hours, 7 days, last month or of all time. Some of the stuff on here is pretty interesting. Todays top post was of Christian Bale blowing up on the set of Terminator Salvation. Below is the audio link. Just click on the picture:
Another fun post that got a high rating is this image. The tag line reads:
The middle picture will haunt my dreams