As was mentioned earlier it's the pervasiveness that is different now. When we were kids, if you got bullied at school you went home and didn't get bullied anymore until the next day. Now, you go home, and it continues online. Perhaps even worse than in person. If a parent thinks "keep them off social media" protects their child, it doesn't - the bullying doesn't stop just b/c the victim doesn't see it b/c they're not allowed on the website. That decision could be unilateral disarming which has a whole host of other implications.