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Leave virtual notes around your neighborhood with BlockChalk

With all the location-based services sprouting up, it's surprising to find one that's a little different from the now-formulaic location-based game. However BlockChalk is just that. Instead of requiring you sign up and tell your friends where you're re-enacting The Hangover, BlockChalk lets you anonymously leave messages for your neighbourhood to read. If you're wondering how on earth this would ...