Yup, you nailed it. I also don't "check Facebook" too often for that to be annoying, and my list of friends isn't all that huge. It's less than 50 people, including the people I don't know.
I only stay in touch with people I want to stay in touch with. There are no ex-colleagues-from-that-job-i-left-four-years-ago-whom-i-met-at-that-concert-an-year-ago-but-can't-quite-remember-their-name. Close friends with whom I really do have links to share and things to chat about.
I hate Facebook's privacy policy (or lack of thereof)
If you only add real friends, there's too much signal and not enough noise to cover it up. This is in line with using tor and using fake locations that change frequently.