The rumor formula is the study of rumor spread. There are two formulas: the lethality of rumors = the importance of information × the opacity of information, and rumors = importance × fuzziness × the critical ability of the public. These two formulas show that the occurrence of rumors is directly proportional to the importance and fuzziness of events, and the public's judgment level also plays an important role in the spread of rumors.

The former formula was summarized by American sociologists G·W· allport and L Pozmann, and the latter formula was put forward by communication scholar Cross Development. One thing (or one person) may cause rumors, first of all, because they are the focus events and hot people. One of the most important reasons why the four major rumors encounter the fate of "the more they talk, the more vague they become" is that "fuzziness" is at work.

In the case that the information is not open and transparent enough, if the authoritative information concerning vital interests is not fed back in time, the public can't judge it, and there is a lack of calm attitude and rational analysis, it is easy to have the idea of "believing it". Once someone maliciously spreads a rumor, the public is regarded as a "setter" and a megaphone.

Netizens also summed up a powerful weapon to crush rumors: counterattack pseudoscience with science; With common sense; Looking for information sources; Rumors often lack time, place, people and other elements; Don't believe "famous sayings"; A picture doesn't necessarily have the truth.