Zenly - Zenly is a GPS tracker to locate your friends in realtime.
sup - The first creep-free way to see nearby friends
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Radar Chat - Radar Chat lets you communicate with people nearby and discover things in the world around you.
MyWhereAbouts - A map of your daily whereabouts, on the blockchain
Babble - A more personalized social network