Buddypress - Clone of facebook

BuddyPress is a wordpress plugin with which you can use for free to make your wordpress blog to a social networking website.You also have an option to download bbPress a forum plugin from wordpress.From a dropdown box at the up left the visitor have an option to search forum groups,users etc.The theme is elegant as wordpress and if you have installed wordpress i think you will not feel any pain in installing BuddyPress.