You all know and love debunking. But have you heard of pre-bunking?
One approach is so-called “pre-bunking” - the targeted presentation of other perspectives and fact-based information. This involves being proactive instead of just reacting. In other words, not just trying to refute disinformation after the fact.
Check out the big brain on Mr. Osintguy. I spent way too much time looking at their sponsors. You can find the funniest shit in their mission statements:
PulseOfEurope: Defend the heart of Europe – with your vote. 
iac Berlin: Understanding and developing relational approaches in the field of philanthropy 
Relational approaches are increasingly recognized for their potential to support sustainable solutions and to nurture greater resilience while navigating complex challenges.
The good Lobby: We democratise lobbying 
Toguna Leadership:
What do we see as the art of leading people? To be an invested sparring partner as those we lead wrestle with the most fundamental questions, we all bring to work and life: Does my contribution matter? Do I belong (here)? Will I stay relevant and have a future (here)?
Front Europjeski: Literally just "European Front", I guess Eastern Front was too on the nose? 
Get small tidbits of information into people early so that when you drop huge propaganda on people later they believe it without question.
This works best with the ludicrously absurd. You can make up some complete and utter bullshit that's entirely unverifiable, just absurd stories, then later on these absurd stories you've done earlier actually make your absurd propaganda seem plausible because it's the place where all the absurd whacky shit you heard about earlier happens.
Places like /r/anormaldayinrussia for example helped to make a lot of the absurd stories and propaganda that has come out sound plausible. It pre-bunked people.
Would warning people about what the propaganda angle might be like "pre-bunking?"
Pre-pre-bunking.