12. Brand Monitoring
Social media monitoring: Klout, Hootsuite, Twittersearch,
Social mention, Technorati, Google Alerts
Social media analytics: Radian6, Sysmos
Information aggregators: Netvibes, Twine, Hootsuite
Collaboration
Wikis: Wikipedia, PBWorks, Wetpaint
Social bookmarking: Delicious, Stumbleupon, Google Reader, CiteULike
Social News: Digg, Mixx, Reddit
13. Multimedia
Photography and art sharing: Flickr, Photobucket, Picasa,
Smugmug
Video sharing: YouTube, Viddler, Vimeo, sevenload, Zideo
Livecasting: Ustream, Justin.tv, Stickam, Skype, OpenCU
Music and audio sharing: Myspace, The Hype Machine, Last.fm
Presentation sharing: slideshare, scribd, prezzi (slide creation and
sharing)
14. Reviews and opinions
Product reviews: epinions.com, Mouthshut.com
Business reviews: Customer lobby, yelp.com
Community Q&A: Yahoo! Answers, WikiAnswers, Askville
Entertainment
Media and entertainment platforms: Cisco Eos
Virtual Worlds: Second Life, The Sims online
Game sharing: Miniclip, Kongrgate