According to:

Phenomena: The Secret History of the U.S. Government’s Investigations into Extrasensory Perception and Psychokinesis

During World War II, the British government planted astrological charts by Sybil Leek that convinced Deputy Führer Rudolf Hess to fly to Britian to instigate a peace treaty with some duke.  Hess was captured and later tried in Nuremberg.  He died in prison.

In current times, Hess style micro-targeting distortion personal belief scales to the entire population.  In fact, this is precisely what Russian GRU did in the 2016 Presidential Election.  However, domestically, the political parties themselves are doing this.  Likely, business marketing departments are doing this or will be doing this.

All of this propaganda will come disguised as Social Media links to articles in news sources from all over the planet.  For each of us targets, it is everywhere.  The list of exploited human cognitive biases is long …

• Availability Bias – it’s everywhere, it must be true
• Confirmation Bias – I knew it all along
• Bandwagon Effect – we and all my friends on facebook believe it
• Belief Bias – I agree with the conclusion so it must be true
• Cheerleader Effect
• … just go through this list.  I ran out of steam.

Take a microphone, an amplifier, and a speaker.  Hold the microphone up to the speaker and hear the screech.  Rewarding extreme beliefs that happen to provide an immediate benefit to the manipulator is a positive feedback loop.  (In the long run, the manipulator is part of this feedback system).  Really, this is not good.