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Media is an instrument on communication, like a newspaper or a radio, so social media would be a social instrument of communication. Social media a group of Internet-based applications/Websites for interaction among people; the people create, share, and/or exchange information and ideas in virtual communities and networks. Social media depends on mobile and web-based technologies to create highly interactive platforms through which individuals and communities share, co-create, discuss, and modify user-generated content.

Social-media technologies take on many different forms including magazines, Internet forums, weblogs, social blogs, micro blogging, wikis, social networks, photographs or pictures, video, rating and social bookmarking. Technologies include blogging, picture-sharing, blogs, wall-posting, music-sharing and crowd sourcing to name a few.

Most popular kind of social media are :

  1. collaborative projects (for example, Wikipedia)
  2. blogs and micro blogs (for example, Twitter)
  3. content communities (for example, YouTube)
  4. social networking sites (for example, Facebook)
  5. virtual game worlds (e.g., World of Warcraft)
  6. virtual social worlds (e.g. Second Life)

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