Do the rules of Facebook etiquette require I respond to each one individually? All in one go, with an additional "wall" post?

Sure hope not. I pretty much always ignore the birthday avalanche (and ignore most everything else people say on Facebook, even directly to me, actually).

And, hey, happy birthday.

At some point I really will drag my sorry ass up to Bloomington -- kinda hoping to wrangle a colloquium talk out of the math department or something so as to have a good excuse.