Telegram is an app the staff have been using to communicate for a while, with the occasional member or two. You can get it here for Windows, Mac, Linux, macOS, Android, iOS, Windows Phones, and Firefox OS. (FireFox OS is a F*cken thing?) You can also use it on your browser.
Their Website https://telegram.org/
Desktop https://desktop.telegram.org/
Android https://play.google.com/store/apps/details?id=org.telegram.messenger&hl=en
iOS https://itunes.apple.com/us/app/telegram-messenger/id686449807?mt=8
Windows Phone https://www.microsoft.com/en-us/store/p/telegram-messenger/9wzdncrdzhs0
Firefox OS https://marketplace.firefox.com/app/telegram/
Mac OS https://macos.telegram.org/
Telegram Web https://web.telegram.org/#/login
Chrome App https://chrome.google.com/webstore/detail/telegram/clhhggbfdinjmjhajaheehoeibfljjno
You do require a phone to join Telegram, but there is a work around here.
http://pinger.com/tfw/
This is the link to join the public group, the rules are pinned, if you break them you will be kicked.
https://telegram.me/darkstormpublic
Wow, trait finally does stuff xd