http://blog.foursquare.com/2012/02/29/foursquare-is-joining-the-openstreetmap-movement-say-hi-to-pretty-new-maps/
We’ve been using the Google Maps API since the early days of foursquare. In the last six months, though, we’ve seen an increasing number of companies migrating to other options. So, during our January hackathon, one of our intrepid engineers wondered what the world would look like if we made our own maps. To do that, he used data from OpenStreetMap. (It’s a crowd-sourced global atlas, and it’s kind of amazing! It’s like Wikipedia for geography.) We love the idea of open data, and were happy to try it out.
