That's a long setup for a short question.
My solution is:
No Facebook.
No Twitter.
No LinkedIn.
No Instagram.
No ex's, no drama, no problems. If someone wants to get in touch with me they call me, on the telephone. If they don't have my number, there is a reason for that. Oh and email, but that's easy to control.
I think the compulsion to have yourself all over the internet is bizzare. My privacy is more important to me than having a picture of my lunch "liked' by some random dip shit I worked with 20 years ago.