[T]he way Facebook works, everyone on your list has the same claim on your attention. So if I made a joke that had a ten-year-history in my family, someone whom I had never met, and who could arguably be the friend of an old acquaintance of a neighbor of a cousin, made a comment about not getting it. It became necessary to explain the joke, which took away some of its humor. Or if I posted a link to an article, along with a line that I thought was clearly sarcastic, someone took it literally. I had to temper the sarcasm, which took away its bite. If I was busy and did not get a chance to respond to an incendiary comment, someone was bound to take it as an endorsement.