Social media is a method of communication at its core. Excluding kids from social media now also excludes them from social interactions. Being excluded is also damaging, and we no longer live in a world where not being on social media is practical.[1] It's better to teach them how to identify problematic content from a very young age and guide them. Blocking access will not accompish the goal you are hoping to accomplish. I think the demographics of who falls and shares misinformation and fake news demonstrates my perspective.

"It is possible that an entire cohort of Americans, now in their 60s and beyond, lacks the level of digital media literacy necessary to reliably determine the trustworthiness of news encountered online." [2]

https://www.unicef.org/press-releases/done-right-internet-us...

https://www.science.org/doi/10.1126/sciadv.aau4586