The Facebook group was shut down. It's not worth my time to manage something that takes a tremendous amount of time to moderate and maintain but doesn't pay me at all. I honest to goodness was spending 4-5 hours per day keeping up with that group and all for nothing. Basically I was giving away all that time for free for years.
In addition, Facebook (and social media in general) is full of negativity, assholes, and trolls. Forums are superior for helpful and useful knowledge in comparison to Facebook. There is actually a life outside of Facebook, most people these days just have such a social media addiction that they can't bring themselves to take a break from Facebook.