I have never (and will never) use Threads. This ad on Facebook shows a screenshot clearly depicting someone having commented on a photo of mine that doesn’t exist. Deceptive, garbage marketing practices from a deceptive garbage tech company. It’s extremely easy to see a tech-illiterate person creating a Threads account just to see what photo of them is on there and who is commenting on it.
And before anyone mentions it, yes I use Facebook. Very minimally. My entire family lives thousands of miles away and Facebook is all I have to feel connected with them.
Your instance is federating with threads though, and you seem to have image posts. Maybe Meta managed to figure out that your Facebook and Lemmy accounts are both you and is referring to a Lemmy post of yours federated to Threads?