Spam.

The comment spam has been awful these last 2 days. I'm talking about robotic commercial spam — in Chinese characters linking to commercial websites — not annoying trolls or anything. I hate to turn on comments moderation, because it disrupts the flow, but I may have to. I can't spend an hour a day deleting comments.

ADDED: I saw that it's possible to turn on moderation just for older posts, which is where the problem is, so this is a great solution for now.