In 1967, the physicist John Wheeler was giving a lecture about a mysterious and startling phenomenon in deep space that the field was just beginning to understand.
How will Facebook celebrate its 20th birthday? Perhaps it will create one of those cute video montages they like to generate at significant moments. Starting with a tinkling piano soundtrack, a couple of breathless friend requests, and some self-conscious, tentative writing of “hello!” on other users’ walls, it might then pass quickly through moments of chronic oversharing, passive-aggressive, stalking of exes, and horrified untagging of yourself in unflattering photos.