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.