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How will they connect the clue to the player? Without a clear line of reasoning, relying on the host's imagination could lead to no one understanding where the clue is, let alone being able to solve it. And if they follow a specific scheme and don't broaden the search, they'll probably find it quickly.
And Wikipedia is a good starting point.
Everyone uses Google to find the Mafia.
Ha-ha.
I'm just kidding.