I have never had a social media account under my real name, apart from Linkedin, which is just there to show me for possible employers.
When I google myself, I only get results about my address and my Linkedin profile, so I do atleast exist.
As for advice about joning something like Facebook…
Stay away from politics.
Don’t just “like” random stuff, be selective and only “like” stuff you really enjoy.
Do not engage with dickheads, people will be mean to you, block them and move on, don’t engage, you can just leave.
Stay away from politics.
Never post photos of your kids/family without explicit, preferably written, consent.
Be open to take down any photo of a person if said person asks you to.
Stay away from politics.
Avoid posting content about vacations before and during them, bruglers have been known to use that info to know when a house probably is empty.
If you are a woman, please be extra careful posting images of your face online, people have and will continue to take faces of women in particular and photoshop them into porn, it is sad, but is a reality.
Be mentally prepared for a lot of hate, whatever you post, you will sooner or later annoy someone online, or even just come to attention of certain people, and they will swnd you hate filled messges, block them and don’t engage.