Non-paying customers are important for a system. Best way to represent this: Ladies night.
(he made "Causes, Zombies, Vampires, Werewolves, Slayers")
MySpace => Self expression focused
Facebook => Communication focused
Making non-games viral: requires it to be valuable to both sender and recipient. [note: Think bittorrent...?]
People are selfish - they'll ask "what's in it for me?"
Hahaha, fluff friends apparently didn't use invitations in the beginning - it was all profile discovery. We should fix that. :P
Look at ghost racer? Racing recording of friend races.