Human beings are social animals. There is an inherent need in them to connect and expand their connections. There is a deep rooted need among humans to share Social networking has always been prevalent; it is just that in these times the face of social networking has changed. Where earlier the process was long drawn, involving a chain movement where in one person led to another through a web of social contacts, today the process is highly specialized. Social networking sites have recorded phenomenal growth rates. These networks allow individuals to leverage the connections they establish within the social network to achieve a broader objective like job search, a real estate search, a holiday trip plan, etc. This paper will bring into picture various aspects of Social networking sites. We have studied various sites such as Facebook ,Twitter , Linked in in this paper.