Because mass communication theories are created by people, and therefore influenced by human biases, the times in which we live, the position you occupy in the mass communication process, and a host of other factors, we can say that these theories are:

We can say that these theories are human constructions.
These theories were constructed, or created by humans, which makes them human constructions. They didn't exist before humans made them - they weren't previously part of nature around us. Rather we created them to suit our own needs and to make us understand life in general. 

Afederal parliamentary republic is  unlimited.