re: WC 100K Post Challenge - You Ready?!
Looking at alternatives for WhatsApp, searching for most used messengers in Switzerland.
First link, a representative survey stating that 91 % of Swiss people use this service. The alternative that's stated the most is not available on Windows Phone (Threema). Skype is not a possibility as many people go offline when not using it, for example my girlfriend.
So now I could just randomly install different messengers and see how many people in my contacts have it too. But that seems a little tedious.
So I'll just won't uninstall Whatsapp and hope it comes back.