Facebook (www.facebook.com) holds 2nd rank in the world wide web and it is the largest and most popular social networking site in the world. Facebook was launched on February 4, 2004, by Mark Zuckerberg with his other friends and it had over 1.3 billion active users all over the world as of 2014. Facebook gives many facility to its user like common – interest user groups, groups organized by workplace, school or college or categorized friends in lists as “People from work” or “Close friends” etc.