I do believe that the Rush style radio talk show lays the foundation for Tucker Carlson and all of the conservative pundit TV programming. Which is the basis for the problems we see with Facebook / Fake News etc.
This is really basic bio stuff about Limbaugh, and it doesn't speak well of your other assertions if you got this part so wrong.
What's really funny is that during the 90s the "Greatest Threat To Democracy Ever" WAS talk radio, more or less solely because the Limbaugh program was so popular. The targets may change, but the talking points never seem to.
Love that the Catholic Church burned him at the stake for being too conservative. Really! Go Renaissance Popery!!