SFI has great ways to communicate with your team, but am I missing out by not using outside resources too like email, Facebook Messenger, WhatsApp, etc.?
This is a good question. I will suggest you to use your FB (messenger) or Whats App for faster communicate with your team. So it is better for them to know that you are always there for them.
There is also Viber and Skype where you can talk. When you are doing some bigger stuff, it is easier to talk than to type, typing tooks so time.