Swarm - Keep up & meet up w/ your friends (pre-launch)

Pretty interesting - communication options for friends: phone call, SMS, Facebook Messenger

Really digging on the plans functionality

I wish I could change notifications to only ping me when people are very close. The settings seem tuned to non-cities, which is probably smart, but mostly useless for me in San Francisco. If my friend is a mile away, there is a 0% chance we're going to meet up :)