Social game ideas – open ended, multi-sponsor ARGs

My background in games and the current state of things I have been a game player since my grandfather taught me to play chess at the age of 4. In my youth I played ADD, Shadowrun and many other role playing games – usually at the DM. At my high school there were a bunch of us who played all types of games on a regular basis, we played many boardgames after school, had ADD campaigns including one we ran at times over lunch in the cafeteria and were regulars at the local games shops.