For about a week now I have done been using an app called Bottled. It’s available for iPhone and android, has quite a simple premise.
You can send messages to other people around the world in the form of a virtual bottle with paper inside. The app allows you to chat with them directly if you wish and if you don’t want to chat, you simply put it back into a virtual ocean for someone else to discover. Best bit is you can track it’s movement around the world and chat with anyone from say, Canada to New Zealand. It’s quite a fun way to waste time.