Looks very similar to Ding Dong (https://www.dingdongapp.com/). They recently made a big update more focused on location (http://techcrunch.com/2013/11/14...). Curious to hear @nchirls' thoughts on this. Ding Dong is a betaworks investment and Nick wrote about the investment several months ago here: http://nickchirls.com/what-i-lea...