I like the idea but it seems rather US-centric currently. I'm finding it almost impossible to filter by London, UK - a whole load of other locations containing 'London' across the US show up instead. Similarly, trying to reposition the map to London requires a lot of scrolling of the map, because I can't zoom out far enough to see enough of the globe. As it stands it's very difficult for me to use unfortunately, but hopefully it won't be too hard to improve the UX for an international audience.