This who conversation seems a bit simplistic and reductionist.

Sure the brain grows and changes but just pointing to 'neuroplasticity' -- a concept none of us really understand and saying 'it's all good' -- isn't that insightful because it's too one dimensional. At the end of the day we can say that this must have some permanent effect on the brain because people remember their time on social media, right? Yes, it's a mixed bag with some positives from social media but at the end of the day there's an opportunity cost for the time that they spent on social media in the form of times shared with loved ones, the formation of positive relationships in the real world, and perhaps career opportunities.

With that said the bigger issue to keep in mind is that the people who push this kind of technology on society do so knowing that it has negative consequences for individual users and society as a whole and yet they push it anyways for personal profit. And more than just pushing it they actively lobby the government to change laws or prevent regulations from being enacted that would stop them from doing so.

This is odious behaviour and it should be stopped and the people involved should face personal consequences for damaging society so casually.