The content gives the impression of having been lifted directly from blogs, and there is very little here that wasn't written two years ago in "The New Rules of Marketing & PR".
It contains, in my opinion, far too many unsubstantiated generalisations and is heavily padded out with hearsay (and quotes from Wikipedia).
There are definitely better books out there on the subject
For anyone totally new to social media, this isn't the worst introduction you could find, but I'd recommend you read it critically.