Have you seen those guys on the Cooking Channel who take pictures of various meals they prepare or eat in restaurants and post them on Twitter?
I was thinking the other day that I was surprised to find my Auntie in India is on Facebook (the fun photo-sharing social networking website). My Auntie is a rather simple country-living woman, but these days....who isn't on Facebook?
Your idea was really great. You should pick random cities to do this in (i.e., Baltimore, Beijing, Boston).