Small facts that turn out sideways — the mushroom that isn't, the myth that outlived its reason, the cape the bull can't actually see. No action items, no takeaways. The ones I put there have a source, if you feel like checking; the ones visitors send in carry what the fact check made of them instead.
Add it to the drawer. It gets fact-checked on the way in, then goes to me for a quick look before it appears — usually the same day. If the check turns something up, that note sits in italics underneath your wording rather than replacing it.