Yes it is no joke. From today on you can use WhatsApp on your PC with the convenience of a normal keyboard. Unfortunately this is not available for iPhone users... but who has an iPhone anyway.
To get startet you need to install the lastet version of WhatApp. Go to Playstore and update your current version to the latest one. After that you need to open Google Chrome (yes not Firefox or IE or whatever) and go to web.whatsapp.com where a QR code is displayed.
Next you need to open WhatsApp on your mobile, go to Menu und select WhatsApp web. place the QR code into the center of your screen and.......thats it.
Please note that this service connects to your phone to use WhatsApp. To reduce costs your phone should be connected to a WiFi network.