Looks like it’s (at)username(at)instance. So for you it’d be @CheesyGordita. It doesn’t suggest or autofill the instance or anything so you gotta know their whole deal.
(well that links to the user in question anyway, I assume that also tells them there’s a mention)
Sociopaths. Had a regular customer who would do this then tell on himself but try to blame it on “someone” like it was already there when he got there. Chief, we’ve been open 15 minutes, you’re the first person to go in there today.