Back in London this weekend I was persuaded to visit the Rothko exhibition at Tate Modern. It was a good show, but with a bizarre and slightly sinister follow up.

About 24 hours later I acquired another Twitter follower, this time a Mr Mark Rothko. A quick dash to his posts revealed that the artist, who died in 1970, is still hard at work in his studio and posting updates to 30-odd followers.

So what's sinister about all this? Not the presence of deceased celebrities on Twitter for sure. A quick search reveals Dr Benjamin Spock and Anais Nin amongst others haunting the Twittersphere  - no doubt sharing cloud computing anecdotes with Francis Bacon and Stirling Moss.

I'm more perturbed by the way in which I'm being haunted just a day after visiting the show. I can't believe that this is coincidence any more than I believe that one of the world's most accomplished abstract-expressionists has chosen to channel his oeuvre from beyond the grave via the world's fastest growing presence awareness application.

So what's the answer? I paid for the exhibition tickets with my credit card and I think my name appeared on the ticket. Did someone eyeball these details? Is this a cunning marketing exercise by Serota and co? No answer so far from Tate Modern press office, which remains curiously silent on the topic. Spooky.