I got a facebook account because I wanted to use marketplace. I just use one of those CSS browser plugins to hide the newsfeed which is where all the ads pop up. The following does the trick for me:

    [role=main] {
      display: none;
    }

If you're still using Facebook, it's because you're required to or you're the kind of person who won't be fazed by this.

you could use NoBook or MaterialBook, both on Github, personally I don't have FB account 10+ years and not missing it (besides marketplace, though don't see even there better deals than local classifieds website)