One thing for consideration, I suspect that some people are hesitant to discuss firearms related activity on a public forum due to the current political climate. Always some suspicion that a fed-boi from the AFT be watching for posts like "I'm stockpiling P80s, reloading my own ammo and building new ARs from my 3d-printed lowers".
And like others here have stated as well, I don't use any of the Social Media sites, so no face book for me! I depend on forums like this one for my information. Smaller forums like this one are nice as they don't have the same snobbery and flaming like you see on some of the bigger forums.