What is a Social Network?
Social networks focus on online communities of people who share interests and activities, or who are interested in exploring the interests and activities of others.
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. (from Wikipedia, edited) What Are the Main Social Networks?
General Features
Facebook is a great place to build your profile and network with others. You can also start and join groups relevant to your interest.
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Case Studies
Eight Secrets of Using Social Networking Sites Effectively