Final answer:
The social communication model is characterized by narrowcasting and audience fragmentation.
Step-by-step explanation:
The two major characteristics that separate the social communication model from the broadcasting mindset are narrowcasting and audience fragmentation.
Narrowcasting refers to the ability of new media to aim at more discrete and specialized audiences, as opposed to broadcasting which targets a mass audience.
Narrowcasting allows individual communicators to create content that is specifically tailored for smaller and more socially, economically, and politically distinct audiences.
Audience fragmentation is a result of the rise of new media and the decline of mass broadcasting. With the availability of various media sources, individuals now have the freedom to choose the news and entertainment they want based on their personal interests and cultural backgrounds.
This fragmentation means that the old mass-media pursuit of lowest-common-denominator content is no longer necessary or viable.