This is the automatic tool that uncovered and erased Jonathan's test edit and probably Erin's too -- it's called STiki. It's not actually all the way automatic, though -- the page says "STiki is not a Wikipedia bot: it is an intelligent routing tool that directs human users to potential vandalism for definitive classification." So basically someone somewhere was probably spending some time looking through possible vandalism edits and decided not to keep some of the ones our class submitted.
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