Another strategy is to compliment them, it may alert some people, but as long as you have someone to back you up, you should be safe. It also requires the impostor to have a low IQ or his/her guard to be down.
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0 ups, 4y
yo i did that and it didn't work they thought i was lying because u know how dumb among us can be
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0 ups, 4y
This happened when i first played and now i do it as a meme:)