Telegram on your desktop
Telegram is a competotor of Whatsapp. Not as many users, but a lot more features and it can be run without your telephone connected.
To add the Atareao Telegram PPA and install the official Telegram Desktop application in Ubuntu / Linux Mint and derivatives, use the following commands:
sudo add-apt-repository ppa:atareao/telegram sudo apt-get update sudo apt-get install telegram