Well I do know people IRL and elsewhere who do identify with transmasculine. I find the term a bit "clinical" but maybe useful. I don't know anybody IRL who isn't really FTM or whatever. But there are probably posers on tumblr. It's a good place to pose.

Anyway the people I know are maybe genderqueer (or whatever term you want to use here). They are maybe more androgynous but identify more masculinely. Some of them will get top surgery and take low dose T and some will definitely not. There are also people who have struggled a bit with their identity and in my case, now that I know what the terms are, have definitely done this. I see some of them, I think they may transition at some point, but they use the transmasculine to kind of rest at a point where they can think things over. This was my situation. I used the term "ftm lite". But I am pretty sure there may be people who are not in either of these situations.
BTW, I used the ftm thing today with a pharmacist who was just too darned confused with why I was getting both T and also a female type product. He was starting to call me Miss. I said, I was Jay and that I was a female to male transgender person. They are very trans friendly there but they definitely needed help to get it.
--Jay