If you've ever used Facebook, log out of Facebook then try this search:
site:facebook.com "your name"
I don't share publicly - but I do post and comment on "Pages" which belong to organizations.Those pages are always public, so what I have written there is also public.
You can't make these posts non-public, but you can delete them. Log in to Facebook, then repeat the search. You should now see a delete box.
I found some posts could not be deleted. I got the "failed to hide minifeed story" bug on one.
PS. In the midst of this exercise my (true and unusual) name was registered as a Tidbits author with a 1996 article. This was a puzzling experience, because it was at first completely unfamiliar. As I read it, however, it became vaguely familiar. I remember the ideas, if not the article. I'm pretty sure it is mine. Weird.