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It is a grouping of individuals into specific groups, like small rural communities or a neighbourhood subdivision, if you will. A social networking service is an online service, platform or site that focuses on facilitating the building of social networks or social relations among people.
e.g. people who share interests, activities, backgrounds or real life connections. When it comes to online social networking, Websites are commonly used. These Websites are known as Social Sites. The most popular social sites are currently Facebook, MySpace, Orkut etc.
These Websites provide users with simple tool to create a custom profile with text and pictures. Typical profile includes basic information about user, atleast one photo and possibly a blog or other comments published by the user. It may include videos, photos albums, online applications as in Facebook or custom layout (in MySpace). After creating a profile, user can send message to other users and leave comments directly on friends’ profiles.