Who Decides What Is Knowledge?

I enjoy reading Mark Federman’s work over at What Is the (Next) Message. In this talk he says:

How did we as a culture come to decide that certain things are to be considered as knowledge and others are not? How did those that decide such things acquire that very privileged position of knowledge authority? The fact of the matter is that our dominant knowledge paradigm has existed for a very long time — since the 17th century. But the world has changed considerably since then, so I’d like to suggest to you this morning that perhaps it is time to consider some changes to what we consider as knowledge, and who gets to decide, in a way that is consistent with today’s reality.

So how has media impacted the message? Is this better?