Urban prankster is a site for people that get together and arrange fun happenings in urban environments, sometimes disguised as "agents" to increase the impact and keep some moment of surprise for people passing by.
http://urbanprankster.com/
Another site like this is
http://improveverywhere.ning.com/
So maybe you want to act also, a good start is to create your own social network at Ning.com, like any public blog site but for social networks.
