The opposite could also happen. You are not a pedophile. The mob says you are a pedophile. The mob runs the fact-checker, which now says that you are a pedophile.

Any “fact-checker” is going to have the problem of needing to arbitrate truth, depending on your arbiter you can have lots of different truths. You include facts that help your case, and ignore or downplay facts that do not help your opinion.