If mere exposure to bad ideas is this dangerous then mass scale democracy is not viable. The viability of democracy beyond very small groups is dependent on the idea that human beings are capable of independent rational thought and of discussing and evaluating ideas on merit. If that's not the case then the neo-reactionaries are right and democracy is doomed to failure or worse.
What I see here is a major freakout over Trump. IMHO feeling alarmed about Trump is justified, but throwing basic freedoms and the idea of the open flow of information out the window is not the right response. The right response is to ask how and why Trump won and address the problems, ideas, and arguments that led to it rationally. The solution is also to learn how to use this new medium better. If Jones' BS is more "viral," then more rational thinkers need to learn how to play the viral game. You must learn to communicate effectively using the media of the time. If you use social media you must learn to be viral just like previous generations had to study the art of the persuasive essay or how to do makeup properly so you don't look like a sweaty pig on a TV interview (see Nixon vs. Kennedy TV debates).
If it really is true that bad ideas are inherently more viral than good ones and that cannot be combatted, I do not see how democracy can survive at all in the Information Age.