The ability to learn from other people without needing the same first hand experience is a hallmark of intelligence. It’s one of the things about our species that allowed us to develop past just being yet another animal in the wild. Education is largely based on that principle; your history teacher didn’t experience the horrors of trench warfare firsthand.
So I wouldn’t call social media insanity so much as potentially addictive, which can cause you to overindulge in those behaviours. Admittedly addiction can feel like insanity when you’re in the throes of it.