Use Reach to communicate with everyone in your radius. Theres no need to register contacts and friends, just post to all users in your reach.
Your posts may be re-shared by other users and travel through space and time. Your reach will increase as others interact with your posts.
Although Reach needs your location to verify if posts reached you, your location will not be identified with your profile.
Continued use of GPS running in the background can dramatically decrease battery life.