Just because you are not familiar with Web technologies doesn t mean we should deny the world of their descriptions The Web of Contacts was the model used by SixDegrees com and was an agent that built social networks The Circle of Trust was a model that allowed people to indicate the users they trusted The Circle of Friends which is used on Friendster and MySpace allows people to manage their social network The Old School Tie used by Classmates com is a social networking system that allows you to link up with old school friends