Page 29 "Find a Clue" talks about adding the "rumors" modifier to your role but it isnt mentioned anywhere else
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The +Rumors here is how many rumors are being told during the move. The player doing the move can tell up to 3 rumors and then roll + the number of rumors they told. My guess is that the intent is to mechanically reward the player for doing more narrative work, as the outcome of the move is that some of these rumors become true or false.