Share 'Opening the floor up to the Addictiveness of Online Social Networks'

Faris just blogged about the addictiveness of Online Social Networks at ‘Continuous Partial Presence’. I just thought I would once again open it up to people suggestions as to why Online Social Networks (Myspace, Facebook, Account Plan.ning) are so addictive? Thank you to everyone who posted about ‘Why Second Life will fail?’, this gave me a great artillery in a recent debate that I had with so…