Blogs, Micro blogging,Social networking, Location -based social networks, Events,Information Aggregators,Online Advocacy and Fundraising, Wikis, Social bookmarking, Social news Social navigation, Content Management Systems, Document Managing and Editing Tools, Collaboration, Photography and art sharing, Video sharing, Livecasting, Music and audio sharing, Presentation sharing, Media and entertainment platforms, Virtual worlds, Game sharing, Product reviews, Business reviews, Community Q&A , Social media measurement,