Everything that has advantage has disadvantages. A lot is gained from social media no doubt, but about the disadvantages you mentioned, I think it is best not to believe everything you hear in social media. A whole lot of twisted news exist in social media.
As for our youths, it is good for them to get informed but for real many academic performances of these children have dropped due to intense use of social media
Children need special assistance from parents and the environment. It is the duty of all of us to protect them.