Dragon Warriors group
Advanced Dragon Warriors group
Fabled Lands group
Role-Playing Games group
Stuart Lloyd has kindly provided the link to a Facebook group for The Way of the Tiger, and I'm sure there are forums for it. There's even a blog. Likewise Bloodsword. There are probably more up-to-date sites too, but I'm going in the other direction from social media myself, as most of what you find posted there wouldn't even pass the Turing Test.
If you're up for stimulating discussions about roleplaying, the best place for that these days is the Improvised Radio Theatre With Dice forum. Or why not come over to the Jewelspider page on Patreon? Maybe I'll see you there. No cat pictures, I promise.