"'Yo' is a single-tap zero character communication tool. Yo is everything and anything, it all depends on you, the recipient and the time of the Yo," according to the app store description.
Developed by San Francisco-based Life Before Us, LLC, the app's creators describe it as "the simplest & most efficient communication tool in the world."
And it is really as simple as it sounds.
Download it, choose the friends you want to send your "Yo" greeting to, and they get a push notification on their phone and that's it. Seriously.
Here's the premise behind the mobile app Cloak: Cloak will scrub the data of your "friends" using their Instagram and Foursquare information (remember, these are things they voluntarily give out) and display them on a map using your phone's GPS. Just like that, you can completely avoid them in real time as they update their information. There's a few problems, of course. Namely, you're only going to be able to avoid people that incessantly update their every move on social media - though to be fair that seems like the perfect kind of person to excise from your life forever.
Then there's another matter entirely, that this is actually kind of a dream program for stalkers. So, uh, double-edged sword I guess?