Draw on your friend's lock screen using LokLok

Yo is not the only app that will let you receive messages on your lockscreen – LokLok will do the same, albeit in a more creative way: using doodles. It’s great for communicating small, intimate gestures, or, just a simple way to send a picture with a question mark. For example, if you don’t know which wine bottle to pick for dinner, just send a picture with a question:

The app can only work on Android because it replaces your lockscreen with a synchronized, shared whiteboard.