Which dead writer or thinker would you most like to read the blog of? The only constraint is that they can't use any of their own historical expertise or experiences (except maybe as analogies), but instead must discuss current events while bringing only their biting wit to the table.
I would probably go with Franz Kafka. His biting wit, snark, and appropriate dose of melodrama seems well-suited to today's South Park-groomed internet denizens.
What about you?