Why do people use eye contact and body language to visually communicate rumors semi-covertly? Why do even those who claim not to gossip still do this?

Why is this such a societal norm? Is being up front and open with everyone really such a forgotten standard of good manners?

Why do people use eye contact and body language to visually communicate rumors semi-covertly? Why do even those who claim not to gossip still do this?
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