«المتواتر: هو ما رواه قوم لا يحصى عددهم، ولا يتوهم توافقهم على الكذب»
Mutawatir is what is transmitted by a multitude too numerous to readily enumerate and not plausibly presumed to have colluded on a lie.
The criterion is not a magic numerical threshold. It is a degree of numerous, credible and independent transmission that removes a reasonable possibility of concerted fabrication.
A few people repeatedly circulating the same statement do not automatically produce tawatur. The nature and independence of transmission matter.