Internet - Berkeley, California, United States
Radius is a web and mobile app that lets you be in multiple places at the same time. You can create, discover, follow, and contribute to beacons, location-tethered hubs for discussion and media sharing related to a place.Radius was founded by recent Duke University graduates who are determined to enable everybody to cultivate and explore the world's digital layer.(Note: as of 2013, Radius is no longer operating)