I don't do much on FB since its like the wild west, I have a dedicated IG account (check me out- 'littlebigreef' !) where I meet, trade, and sell with a lot of folks. It's also a good way to share the hobby, you can actually see my body of work and everything I've done since I started the account 4-5 years ago. Craigslist use to be good but there's a few local guys that create a post for each coral they have and then auto renew the post effectively burying your post on the second or third page (perhaps one of the most d!ckish moves IMO). I know many of the local guys so we always talk when something new is available or to coordinate group buys. But, far and away, r2r has been the best. I've been able to find some of the true gems of my collection on here and I appreciate the other members that make that possible- so THANKS!!! I prefer r2r because its a community and people come here not just to look at stuff for sale but also to contribute to the forums. There is a difference there. And I've seen bad actors get ferreted out pretty quickly.