It's plausible. I've had coworkers show me something on their computer with their shittit accounts logged in. And yes I've looked up their accounts later because I'm nosy as shit. You can bet if some fat cunt I didn't like had nudes in her submission history I'd wait a few days and do the same shit OP did. Because now she doesn't know who at work did it, and that's awesome. She also can't make a big scene about it, because then everyone at work will see her fat flabby-ass nudes.