This Common Craft video explains how a social network can connect you with people you don’t know but might have a common interest. Connections are based on common friends or business acquaintenances..

Common Craft Video

Wikipedia lists over 200 existing social network sites found throughout the world. Some may focus on making connections based on friendships, academic peers, music, books, or science. Check out the existing sites using the link below.

Wikipedia List of Social Networking Websites