It is believed that early man used sign language to communicate with each other. Later on he learnt to talk. Then, he began to use smoke signals to communicate over long distances. Then came the advent of letter writing. The 19th century has witnessed the invention of the telegraph and telephone and as a result human interaction has become easier. But the most phenomenal method of communication and interaction evolved in the 20th century—the Internet. The Web started from bulletin board services and forums and has evolved to a more complex method of social interaction—social networking sites. The sites offer a safe, secure and fun-filled way for people to connect, interact and socialise on the Internet.