From time to time over the last 30 years or so I've had fixations on celebrities which has spurred wasteful daydreaming. I have posted to websites or written letters in the past to make the exchange real and concrete. I've told myself to forget about this nonsense. But today in order to curtail some MD, I sent off a sarcastic comment to Dido's Facebook. I told her that her breakout song 'Thank you' was the worst song she ever made, that M&M had a stroke of genius by sending her off the…