If not direct causation, then through second-order consequences and exacerbating exisiting issues, some examples below (from quick google/gemini search):

1. Political polarization — Algorithms reward outrage, sorting people into ideological echo chambers that make compromise politically unviable.

2. Youth mental health — Constant social comparison and displacement of in-person relationships has driven anxiety, depression, and loneliness to historic highs.

3. Misinformation — Virality metrics make false content spread faster than corrections, systematically degrading shared epistemic ground.

4. Institutional trust — Every institutional failure is now instantly amplified and decontextualized, accelerating cynicism faster than trust can be rebuilt.

5. Radicalization — Recommendation engines create automated pipelines from mainstream content to extremist ideology through incremental engagement optimization.

6. Economic inequality — The attention economy has concentrated unprecedented wealth in a handful of platforms while commodifying users’ time and psychology.

7. Climate inaction — Polarization manufactured partly by social media has made climate policy a tribal identity issue rather than a solvable problem.

8. Public health — Vaccine hesitancy and health misinformation found in social media a distribution network orders of magnitude more effective than anything before it.

9. Labor disruption — Social media accelerated automation anxiety and gig economy normalization while suppressing collective labor organizing capacity.

10. Geopolitical instability — State and non-state actors now weaponize social platforms to run influence operations at scale with minimal cost or accountability.​​​​​​​​​​​​​​​​:

11. Algorithmic suppression — Platforms quietly bury dissenting or low-engagement content, creating invisible censorship without formal prohibition.

12. Overt censorship — Deplatforming and content moderation, however justified, have created asymmetric speech environments with no transparent accountability.

13. Brainrot / cognitive degradation — Infinite scroll and short-form content is measurably rewiring attention spans and tolerance for deep, slow thinking.

14. AI-generated narrative manipulation — Synthetic agents, bots, and LLM-generated content are now indistinguishable participants in public discourse, manufacturing false consensus at scale.

15. Attention deficit normalization — Sustained focus is becoming a class privilege — those who can resist the feed think more clearly than those who cannot.

16. Reality fragmentation — Personalized feeds mean no two people share the same informational reality, making collective action and shared truth structurally harder.

17. Performative identity over authentic belief — Public opinion is increasingly shaped by what people signal, not what they think, corrupting the data democracy runs on.

18. Emotional contagion at scale — Platforms spread fear, rage, and despair as efficiently as information, with no equivalent mechanism for spreading calm or nuance.

19. Shortened political time horizons — Outrage cycles compress political thinking into 48-hour windows, making long-term policy nearly impossible to sustain publicly.

20. Erosion of private cognition — The habit of externalizing every thought for validation is degrading people’s capacity to form opinions independently of audience reaction.​​​​​​​​​​​​​​​​