““BlockChalk is a virtual community bulletin board for neighborhoods in nearly nine thousand cities. In function, it is like a hyper-local version of Twitter. From your cell phone, you can leave a message for someone on your block or street, whether it is to report something you found, announce something happening in your neighborhood, ask to borrow an item, warn people of something to watch out for, or just chat. A typical “chalk” (BlockChalks’s word for a message) reads, “Found dog while running last night @River Bank De & Poppy Way in Edgewater . . . Please post on here if he’s yours, or you know who he belongs to.” It was created by Josh Whiting, who was formerly a senior engineer for craigslist and Del.icio.us, to make it easy for neighbors to interact with each other. Recognizing that some users will want to keep their identity and location anonymous, you can reply privately or respond publicly, “chalkback.””
