Was there plausibly a threat in it?

If it took the visit to realize that you're not very anonymous on the internet, you owe them for the lesson.

No, I know the line and have always been careful not to cross it. On the contrary, I resent them for the Gestapo tactics in retaliation for legal speech. I'm aware of my relative lack of anonymity online. You don't know who I am, I'm absolutely positive the feds do.

I’m not trying to be creepy or anything, but I clicked on your user name, and your profile has what looks like a real name on it.

Yes, it seems like that's my real name, doesn't it?