Is not about that, it's about the responsibility of parents to teach their kids about the dangers and negative effects of social media. Most kids don't have problems with drugs even tho their parents aren't there to always check them.

That's diverting the responsibility of providing an inadequate environment for a child i.e. an excuse.

As shinpud said, it's about teaching your children. It's not about being big brother and monitoring their every move on the internet. There are also steps a parent can take to reduce the probability of inappropriate material that may appear.