Final answer:
Contagious diffusion is the term that describes the rapid, widespread diffusion of a feature or trend throughout a population. An example is the spread of a viral video on social media.
Step-by-step explanation:
Contagious diffusion is the term that describes the rapid, widespread diffusion of a feature or trend throughout a population. It happens when a phenomenon spreads from person to person, similar to the spreading of a contagious disease. An example of contagious diffusion is the spread of a viral video on social media, where it quickly reaches a large number of people through sharing and reposting.