So what do we learn from this? That nature abhors a vacuum and that online identity management is a bit more complicated than it looks. While I'm not condoning any type of identity misappropriation, Dawkins brought it on himself in that if he had used Twitter, this wouldn't have happened. This is what happens when you don't join the conversation.
Where do we go from here? Well if I was Dawkins, I'd start by sacking my publisher/agent for not getting him on Twitter in the first place.