On a recent lazy Saturday morning, my daughter and I lolled on a blanket in our front yard, snacking on apricots, listening to a download of E. B. White reading “The Trumpet of the Swan.” Her legs sprawled across mine; the grass tickled our ankles. It was the quintessential summer moment, and a year ago, I would have been fully present for it. But instead, a part of my consciousness had split off and was observing the scene from the outside: this was, I realized excitedly, the perfect opportunity for a tweet.