LocalFun

You can record eight seconds audio or video and post it on the map provided either within one mile or three mile away from you.
You will have three types of voices to choose — a chipmunk, your original voice, or Darth Vader. And filters for videos as well.
You can search those audio or video posts shared by other users within one mile or three miles away from you too.

Get familiar with people who you see everyday but didn’t get a chance to say hi.
You can just leave an audio or video post on the map and tell them what's up!
By interacting with those posts, you know they are there for real. Say hello next time when you meet them at a cafe:)