Let's say that you have a blog, not a personal blog but a topical blog, to which several people are subscribed. You look back at one of your posts and realize that you have written something UNBELIEVABLY stupid and unfactual. It's such a stupid mistake, you have difficulty believing that you wrote it, and can't remember writing it. You share blog links with people who are very knowledgeable in the topic, and some of them read your blog. You know that if they read it they will think that you are a moron because you've messed up on such a basic fact, but you've posted it some time ago and some of them have probably already read it, so somebody may notice if you try to just quietly delete the whole blog post. You don't want future readers to read it. You can't simply delete a sentence or two, because a large chunk of your post presents an argument based on the incorrect fact, and wouldn't make sense if you took that part out.
What do you do to fix the situation, if anything?