Media that is passed from person to person.

 – Video that becomes popular via Internet sharing

 – Marketing strategy that uses existing social networks to promote a product

 – Mass news media that influence many people

 – Phrase describing excessive media coverage

 – Type of editorial tactic used in mass media

 – Thought or idea that can be shared, in analogy to a gene

 – Collective behavior that achieves intense short-lived popularity and then fades away

 – Phrase separating "reality" from "fantasy" or "online"

 – British critical theorist (born 1964) (thesis and book Virality)

 – Computer program that modifies other programs to replicate itself and spread

 – Type of mathematical model used for infectious diseases