He says so in this comment:
Yet again, some impostor is pretending to be me. I do not Twitter, I had never even heard of Twittering until a thread on RichardDawkins.net alerted me to it, and I most certainly have not signed up for it. I am told there are numerous Facebook pages purporting to be mine. None of them is. I do not have a Facebook page, or anything comparable.
I don’t understand the motivation of these impostors. They do not seem to intend malice. If that were the motive, I could kind of understand it. If it were amusing satire I could understand the motive. But the fictitious persona that they invent for me is not particularly discreditable, nor is it funny. The statements attributed to me are not wildly implausible. But they are not mine. They are pure fiction. If anybody can suggest a possible motive I would be curious to know. What kind of person makes up fiction about a real person, which is neither malicious nor humorous but just sort of DULL?
And does anybody know how to let it be known to the Twitter admin people that this is an imposture?
So sad to know there are lies on the Internet…
At Professor Dawkins’ request, please help spread word that the Twitter guy ain’t him.