Like many people, I have started archiving my life’s events on Facebook. My Facebook wall includes cute photos of my dogs, my friends’ zany suggestions using the “Word of the Day” that I’ve posted, and accounts of my geocaching adventures. Facebook also has allowed me to maintain regular contact with friends, many of whom are scattered across the United States (and two of whom currently live in Qatar). I’ve also reconnected with friends with whom I’d lost contact, as well as added...