BlockChalk
september 2009 by bgporter
It’s like a virtual graffiti wall, a community bulletin board, and a poster-covered lightpost, all rolled into one. Using the GPS in your iPhone, it shows you messages that other people have left at the place you’re standing, and it lets you leave your own messages, too. It’s anonymous unless you decide to share more. You can even privately reply to other users while still remaining anonymous.
location
mobile
september 2009 by bgporter