Facebook Pages and/or Groups To Follow

Middle School Math Teachers Unite!
I Love Teaching Math
Flipped Classroom
Evidence-Based Teaching - THE PACT
Learning and Teaching Mathematics
Common Core Math Resources

For personal use, my wife basically makes a living on the "Area For Sale Sites". She also belongs to a group about Instant Pots and before our Jamaican vacation, joined a group about the resort we stayed at. They were/are each tremendously helpful with up-to-date information and TONS of FAQs related to each topic.