Social Networking :

Social networking is defined by linking people to each other in same way. Generally, social networks are used to allow or encourage various types of activity whether commercial, social or some combination of the the two.

A social network service focuses on the building and verifying of online social networks for communities of people who share interests and activities, or who are interested in exploring the interests and activities of others, and which necessitates the use of software.

Most social network services are primarily web based and provide a collection of various ways for users to interact, such as chat, messaging, email, video, voice chat, file sharing, blogging, discussion groups, and so on.

Benefits :

Social networks connect people at low cost; this can be beneficial for entrepreneurs and small businesses looking to expand their contact base. These networks often act as a customer relationship management tool for companies selling products and services. Companies can also use social networks for advertising in the form of banners and text ads. Since businesses operate globally, social networks can make it easier to keep in touch with contacts around the world. In many ways business networking on social networks has eclipsed the amount of networking that takes place on dedicated business networking websites.

Social networking sites :

The main types of social networking services are those which contain directories of some categories, means to connect with friends, and recommender systems linked to trust.