Huh. WordPress.com is doing this Possibly Related Posts thing, where they add links at the bottom of your post. I’m dismayed by the cosmetic presentation—it looks just as I would have written it. But I didn’t!—but intrigued by the idea, interested by how good computers are at sorting out related topics (small sample size says not very good at all), and challenged by the desire to write posts they can’t find related topics for.
They only show up on the individual post page, not the main home page of the blog. I’m not turning it off (via Design>Extras) quite yet, so if you see them, just know that I did not add them myself.