One more trick for you: use messenger.com if you need contact with people at work but don't want notifications or the news feed to distract you.
It's a way better interface for just chatting then the Facebook site and they have been adding new features to it regularly.
My only complaint is that it refuses to work on mobile (even though the desktop site is very responsive). It just pushes you at the app.
It's an electron-based app which allows you to load the web versions of Messenger, Whatsapp, Slack and many more.