I highly recommend the research done by Robert Faris, Hal Roberts, and Yochai Benkler.

In a nutshell, you have an issue where part of the information economy/market is captured. To the point that agenda can get set by theories or podcasts that have little truck with reality. Any checks or reviews of the claims, simply do not get surfaced within that ecosystem. This creates a more efficient system for political messaging.

You cannot have an effective democratic system when your consensus building mechanisms have been (intentionally) compromised and weakened.