OK, in the last two days, robot programs have posted over a hundred fake comments to this site. They’re all ads, of course, many of them for products of questionable legality.
I’d rather spend my time on things other than deleting spam. I’ve added a Question Challenge to the site for posting. You have to answer a fairly obvious question before your comment will be accepted. At least, that’s the theory. Let me know if this doesn’t work, and I’ll try to find another solution to the problem.