Digg is, in it own words, “democratizing digital media. As a user, you participate in determining all site content by discovering, selecting, sharing, and discussing the news, videos, and podcasts that appeal to you.”

http://www.digg.com

User can “digg” news items and select them, and as more users add their votes, the news gains relevance. Votes of frequent contributors have more weight than votes of other users, which at times stirs some controversy. Originally focusing on technology only, digg now covers all kind of news, including political ones, and media in general. Like users of an online community, Digg users can have their personal profiles online. Mine is at:

      http://digg.com/users/marcocantu
    

A similar site, which predates Digg, is Delicious. At this site, people can collect their own links, tag them, and share their links. The site can use the “collective intelligence” to show the most popular pages for a given tag:

      http://del.icio.us
    

This is how Delicious defines tags: “A tag is simply a word you use to describe a bookmark. Unlike folders, you make up tags when you need them and you can use as many as you like. The result is a better way to organize your bookmarks and a great way to discover interesting things on the web.”