I don't think that's any different to any other period of time when communication was suddenly able to expand. Gutenberg's press didn't come with an automatic lie detector that meant the printed word could only contain true facts and nothing else. Instead, it was mainly used for pamphlets and other campaigning propaganda - some of which surely had some truth to it, but much of which was partially or fully fabricated.
I think you are romanticising the past's approach to the written word here. It has always been possible to completely rewrite history, if you're willing to put the work in, and totalitarian regimes have had no issues in convincing their populations to burn their own books if necessary.