I have kids. One doesn't have social media. Too young. We prevent it until they are older, but you can't stop them from looking at friends phones. Two others are not on Twitter or FB. Those are for old farts. Instagram and TikTok I think. They even ditched Snapchat.Do you have kids that use FB or Twitter? Do you realize you can find porn on Twitter? Is this really the free speech you want to see?
Honestly one was exposed to porn in late elementary by a friend with a phone. Not from social media either. Just the web. We had long conversations with that kid. One in particular by my wife turned the corner for him. Had another kid get shown some dark web stuff by a girl with a phone. It literally made him I'll. He stopped hanging around with hear.
My point is that if you have a full proof way to protect them I am all ears. We try and use good relationships, trust, consequences and open conversations about the reality of the world. Teach them to be secure and confident in who they are and it helps with the pressure. They seem to be doing well. They have pulled back from the edge a few times, but so far they pulled back.