It seems easy to categorize and tag posts, so mostly I do. But it’s not easy. And I should know it’s not, having spent some part of life in libraries and bookstores, and some of that time actually classifying books to be published so that they might be shelved more or less correctly in a bookstore.
When I can’t or don’t want to be bothered classifying posts, I simply leave the category and tag blank. But today, I add the new category and tag Who Knows. Because some of the time, maybe most of the time, I don’t.