Privacy settings on FaceBook keep "the world" from seeing it, if you don't want them to.
I had to come out on FaceBook by accident. Ten years ago I had a FBook page in my old gender, just to allow me see some family members' pages and pictures. I never filled it out or participated. I'm from Michigan and live in Colorado. I hadn't seen anybody from Michigan since I moved here 11 years ago, at least. But some high school people found my old page, and asked to friend me.
I am really active on FBook as me, so I had a quandary. I ultimately decided to find some people who were my actual friends back then from looking at people's friends list, and friend them from the old account. Once I had a dozen of them, I set my privacy to let friends of friends see that page, and I sent people private messages, telling them what my deal was - so that people who were close to the old me would not find out by a wall post, or by somebody telling them, "Hey, did you hear that so-and-so is now a woman?!?"
One of my friends, who is not really active on FBook, answered my private message on my wall - and the cat was out of the bag, without me having to figure out exactly how to do it or what to say. So then I briefly opened the old page to let anybody post on the wall, and used my real account to post some current pictures on the old wall, and made the following post:
This is a dead FB account. It was old and forgotten. I decided to use it to let people know, if they cared to try and look, who I am now.If you're a friend, thanks for friending who I really am. Love y'all!
When that was done I set the old account back to friends-of-friends. Then I deleted the notice on my real wall that said I posted on the old account's wall, to make it less likely that somebody I know know could follow the FBook trail back to my old identity, but still fairly easy for someone to follow the FBook trail from my old identity to find me now.
So far, I have renewed a couple old friendships, and had no overtly negative response, although the lack of response from some people has been a bit hurtful, though not unexpected.