Radical: Making social real

Radical makes it easy to connect with the people around you. See who is nearby, view profiles (photo, first name, bio), and see mutual friends or common interests. If you bump someone and they bump you back, you can start messaging right away.

Key features include Discover (nearby people and mutual connections), Bumps (easy way to start chats), Friends organized by proximity, Communities (invite-only), Chat, Pics, and a design focused on minimal battery usage.