The Photochaining blog is a continuous project where people randomly leave memory cards in public places to be picked up and used by others, who then do likewise.
First, take funny/original/creative photos with your own camera using a cheap memory card. Then write a note in which your explain the concept to the "finder". You also provide a name to the memory card (research on Photochaining to ensure that the designated memory card name has not already been allocated). Put the memory card and the note in an envelope. Hopefully the "finder" will pay it forward and you will be able to track images and the journey of your card online.
From the Upcoming ueue, submitted by Ben01.
In your porn analogy, you're still getting pictures of others making love, without actually participating.
I do agree the geocaching thing would be more successful and interesting. And it gets everybody more involved than just leaving a memory card in a bathroom somewhere.
great use for those skanky little 8mb, 32mb cards that come with most cameras.
non-k-ted:
why go to niagara falls when you could read about it? why make love when you could watch porn? life is slightly more interesting when you actually participate. also, this has a distinctly local flavor and emphasis. and this gives a specific focus.