I just took a break from Piketty and, for want of anything better to do, clicked on the link to the spam filter of comments. To my horror, I discovered a wealth of intelligent, thoughtful comments in the spam file that I would like to have responded to, going back quite a ways. I have no idea whatsoever how Google decides what counts as spam, but if I can, I am going to disable the filter, since I think the number of genuine spam comments is small, compared to all those intelligent comments.
My apologies. There really are limits to this fancy new technology. Now, in the old days, I would just sit on one end of a log and a student would sit on the other end, and we would talk. Oh well.