Classification of social networking sites
Communication
- Blogs: Blogger, LiveJournal, Open Diary, TypePad, WordPress, Vox, ExpressionEngine, Xanga
- Micro-blogging / Presence applications: FMyLife, Jaiku, Plurk, Twitter, Tumblr, Posterous, Yammer, Qaiku
- Social networking: Facebook, Geni.com, Hi5, LinkedIn, MySpace, Ning, Orkut, Skyrock, Qzone, Vkontakte, RenRen, Kaixin, ASmallWorld, studivz, Xing, RunAlong.se, Bebo, BigTent, Elgg, Hyves, Flirtomatic
- Social network aggregation: NutshellMail, FriendFeed,
- Events: Upcoming, Eventful, Meetup.com
Collaboration
- Wikis: Wikipedia, PBworks, Wetpaint
- Social bookmarking (or social tagging)[3]: Delicious, StumbleUpon, Google Reader, CiteULike
- Social news: Digg, Mixx, Reddit
Multimedia
- Photography and art sharing: deviantArt, Flickr, Photobucket, Picasa, SmugMug, Zooomr
- Video sharing: YouTube, Viddler, Vimeo, sevenload, Zideo
- Livecasting: Ustream.tv, Justin.tv, Stickam, Skype, OpenCU
- Music and audio sharing: MySpace Music, The Hype Machine, Last.fm, ccMixter, ShareTheMusic
- Presentation sharing: slideshare, scribd
Reviews and opinions
- Product reviews: epinions.com, MouthShut.com
- Business reviews: Customer Lobby, yelp.com
- Community Q&A: Yahoo! Answers, WikiAnswers, Askville, Google Answers
Entertainment
- Media and entertainment platforms: Cisco Eos
- Virtual worlds: Second Life, The Sims Online, Forterra
- Game sharing: Miniclip, Kongregate
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