It’s called “the illusory truth effect.” Very powerful. So powerful that it can override pre-existing knowledge.
I’ve experienced this in several instances myself — even going into the situation knowing something for a certainty beforeheand. It doesn’t matter. Our memory formation is wired for reinforcement, and will adapt our understanding according to the newest information…even if that information is false. It’s pretty crappy situation in the context of attempts to manipulate voters through social media, or perpetuate propaganda, or sell consumers stuff they don’t need.
Here are some useful articles on the topic:
The science behind why fake news is so hard to wipe out
My 2 cents.
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