Why shouldn't schools block social media or why shouldn't they make you not use it during school hours

I think schools shouldn't block social media because it could really help students. Social media could help students in finding newer ways to communicate with one another. It could help a kid be a better person as well for example, students could learn different situations online and in social media and they could see people that need help and have empathy to help one. Social media can help students in learning about things you're not usually taught in school and students could help other people around. Overall I think social media could be beneficial to students in many ways.

(its just a quick answer with ideas, sorry if it doesn't help but i hope it does.)