Good point. Sometimes I wonder if social media, just almost every aspect of it, is the real cancer. Allowing just about anyone (globally) to anonymously deploy information warfare via the social media vector just seems bound to have horrible outcomes. It's just as bad with text as with images or video. Because of social media, we've trained at least 3 separate generations to self-sort into camps with customized ideological info sources that have incredibly-low standards for fact-checking and every incentive to tell their audience (1) exactly what they want and (2) whatever will enrage them most.
AI kind of makes this worse, but also only barely. Because most people really ought to know by now that almost any content could be AI, a video of, say, Trump kicking a baby or violating a goat wouldn't convince anyone that those acts happened (unless they already believed they happened).
Thing is, we're so flooded in biased BS, and no one has any incentive to produce non-sensational, factual news. I absolutely see 'post-truth' as the inevitability. You can't "weed a garden" when it is 100% weeds. The term "news" will cease to mean facts, and just become a branch of entertainment. Kind of the way "Reality TV" went from being supposedly a documentary (e.g. COPS) to just being a flavor of entertainment, where nothing needs to be real.