I run a Mac and everything on Facebook seems to take forever, when it doesn't freeze, so I don't use it as much as a lot of people seem to. But it does have some uses. My wife has set up an open group for posting gluten free recipes. It mostly came out of family members asking for recipes for food we have served, coupled with the growing realisation by many people that you don't have to feel rubbish all of the time and that eliminating gluten is a big step to feeling better. Family are all on Facebook so that's where the recipes ended up.
It's not particularly LC but of course most recipes can be adapted by simple moves such as not serving with rice or potatoes...
Anyway the group is here if anyone who is on facebook feels like adding recipes. All welcome. I've stuck most of those from the "Food" posts over there.