I have a FB account under my female name (and haven't used my old one in a while, actually) but so far I haven't added any photos yet. This will change somewhere after New Year when I will actually be taking the first photos of myself. For now my avatar is the same is it currently is here.
Only people that know I'm trans are on my FB, but that being said if I meet new people I will also add them to that FB. It's not like I'm just telling everyone and their dog about it, but I'm not trying to hide it either. If I get asked, I'll answer honestly.
I've got a few people from on here on my FB as well. I think I have 4 or 5 people? Not quite sure.