I've got a brother who did this. His son is about to graduate med school in the 98th percentile.

More seriously, it's not beyond the pale to introduce them to the internet. The more important thing is to put off handhelds for as long as possible.

>Ideally, you would live in a community where all parents have agreed on the social media limits,

At least on the iPhone, the parental controls are pretty fine-grained. Even if there was a way to have a web-only account on an Apple device, you can block those too (never used that feature though).

You're not going to be able to stop your kids from doing anything unless you shackle them up nightly. However, you can stop them from doing it while under your roof and that significantly curtails their ability to take anything too far.