Honestly don't use social media much. I'm uncomfortable sharing a lot with family members and acquaintances on things like Facebook and Twitter is awful in general, especially these days where all your personal data is being collected by who knows who or what organization. But I'm semi-forced to use them if I want to keep in touch with certain friends because that's all they will use.
I never use my real name/profile image on Facebook or on any social media platform, I use pseudonyms and they all know it's me in my circle because I'm the only one who does. I don't publicly post pictures of myself or my dinner etc. and I only have a small collection of 60 or so friends who know me in some way well enough that they were not likely to get in a huff about any "revelations". So it was easy. I didn't make a big announcement. I hate doing that. It came out in a conversation someone was already having about trans people in which I just alluded to the fact I was one of them, and nobody made a big deal of it. I had a few conversations after about it privately but nobody "unfriended" me because they all actually are real friends whose personalities I can deal with.
I know a few people who just never use Facebook, I wouldn't say you have to use it, or feel pressured to add everyone who asks. I've literally only got people I'm comfortable with on there and not family members for the sake of it. There's are a few family members like my younger brother and sister but they aren't on it 24/7 anyway, and if you tell people you are they have this expectation you'll be on there all the time I suppose. I have contempt for the platform really, its abuse of people's data, the way it seems to make people miserable because all they think they are seeing is other people's "perfect" lives, addiction to likes, etc. but as a means of quick/emergency communication it's all right.
I just remembered I'd been using male avatars for pretty much the entire time I've been on Facebook, and a grand total of 1 person clocked the gender pronoun change when I flipped it on Facebook or felt curious enough to bring it up and ask about it. The rest figured it out or saw that conversation in which I "came out", although as disclosures go it was pretty subtle, practically an afterthought. I preferred to make it so subtle I can watch how other people figure it out on their own, if at all, and how savvy they are. By not demanding anything of them or making a big show I think they took it all great. I think they probably expected I would want to announce it and I never really did.
