The problem with this is, not all my friends are Bitcoiners and you have to be a Bitcoiner to pay for this service.. right? I can contact complete strangers on WhatsApp, without the need to download or

to install any App or pay for these services in Bitcoin. It would be cool if we could find a App like this, where you could send small amounts of Bitcoin over WhatsApp or some instant messaging service.

I only know about something similar, like  http://getgems.org/ where you get rewarded to chat with your friends.