Much less useful than Clay Shirky's Here Comes Everybody, at least to me in my particular age group, I'd recommend it to any late 40s person on up who is being stuff into a career position of overseeing or participating in web communications. Most of it seemed obvious to me, a computer user since my single digit years in the 70s.
I did, however, go mostly cover to cover as it did have a few pages worth of a dogear or a bookmark and was easy and amusing to read.