The possibility of people being untrustworthy is a fact of life. I think it's especially easy for people to misrepresent themselves online, but if I get critical over every post I see, I won't be able to enjoy myself.
So, I don't know. Maybe a third female, a third male, and a third trannies. Maybe better, maybe worse. I don't let it bother me.
Either I like the posts they share, or I don't. No sense pondering the stats.