Misinformation is a genocide engine. That was true before social media (remember Yugoslavia?), and it's true now (see Myanmar for a recent example).
The problem with the internet is that it greatly accelerates factionalization (via filter bubbles, foreign influence campaigns, and algorithms that optimize for outage). It's fertile ground for seeding doubts and conspiracy theories (5g, flat earth, "pandemic", etc). This is corrosive and disintegrative.
To invent civilization, humans had to create and improve countless "social technologies" including language, art, religion, finance, law, corporations, and various schemes for distributing power and curtailing selfishness. The internet (and now AI) are something new and wholly transformative... we need new social innovations to deal with the problems they create. We will have to try a lot of things (many which, sadly will backfire or be abused) and it will take a long time.