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Social Media Sites Categories (According to Resources)
Communication:
• Blogs: Blogger, LiveJournal, WordPress.
• Micro-blogging: Twitter, Plurk, Pownce.
• Social networking: Facebook, LinkedIn, MySpace .
• Social network aggregation: FriendFeed.
• Events: Eventful, Meetup.com.
Collaboration:
• Wikis: Wikipedia, PBwork.
• Social bookmarking: Delicious, StumbleUpon.
• Social news: Digg, Mixx, Reddit.
• Opinion sites: epinions, Yelp, mouthshut.com .
Multimedia:
• Photo sharing: Flickr, Zooomr.
• Video sharing: YouTube, Metacafe.
• Livecasting: Ustream.tv, Justin.tv .
• Audio and Music Sharing: imeem, The Hype Machine.
Reviews and Opinions:
• Product Reviews: epinions.com, MouthShut.com.
• Q&A: Yahoo! Answers, WikiAnswers.
• All Social Media Site Highlights: Socialpunks.
Entertainment:
• Virtual worlds: Second Life, The Sims Online.
• Game sharing: Miniclip, Kongregate.