In mass communication, the audience is

In mass communication the audience is heterogeneous, a large and varied body of people differing in age, region, class, taste and outlook.

The message goes out to many unlike individuals at once, so the receivers cannot be treated as one uniform group.

Calling the audience identifiable is wrong, since a mass audience is anonymous and cannot be pinned to known individuals.

Naming it relatively small reverses the defining scale of mass communication, which reaches vast numbers.

Treating it as homogeneous denies the very diversity that marks a mass public spread across many differences.

Largeness, anonymity and heterogeneity together are the standard defining features of the mass communication audience.