If Darwin published his theory of natural selection today, the tweet announcing it would be deprioritized because it contained a link, and instead Twitter would show you wisecracks that fit in 280 characters.
It is alleged that social media fuels polarization, exploits human weaknesses and insecurities, and creates echo chambers where everyone gets their own slice of reality, eroding the public sphere and the understanding of common facts. And, worse still, this is all done intentionally in a relentless pursuit of profit.