There are a plethora of geo-location-based apps that make it incredibly convenient to do friendly things, like chat with nearby peers about local hotspots or meet up with a coworker on the fly. A new iOS app called Cloak, however, utilizes services from Foursquare and Instagram for a more anti-social purpose. The brainchild of Brian Moore and former Buzzfeed creative director Chris Baker, Cloak identifies the location of friends (read: those you'd rather not bump into) based upon their latest check-in. While perusing the map, you can choose to "flag" certain undesirables, like exes or annoying third-wheels, to be notified when they wander within a preset distance of your personal bubble. Or you could, ya know, skip town altogether just to be safe.