... is evidently quite high: Ghosts of blogging haunt net cemetery. (Hat tip, Vikram Johri.)
Why should this surprise anyone, given the huge number of bloggers? I remember climbing a small mountain in New York state one spring with a friend. On the way we saw what must have been tens of thousands of what I think were salamanders - tiny and orange. They had just made their debut on the plane of existence. My friend told me that only a week later, most would be gone, devoured by birds, other predators, and just plain privation. Blogging is an example of natural selection at work.