Does Social Media have a positive or negative affect on children's mental health?

Well when you look at social media sites like Facebook or Twitter in general perspective, you see that these are sites that are used to communicate to people, to socialize. These sites are used to make friends and communicate with them. That is the main purpose of social media, to socialize. If these are used to get and talk to friend, then they can't be bad to a child's mental health but this is one part of these sites. These sites have many bad parts too. 
      One bad part would be that is everything you post it is stuck there forever. You can put a picture of you doing something that is embarrassing. People could make fun of you for it, and you would never be able to get rid of the picture. Someone could take a screenshot of your photo and print it. Since the picture is stuck on the internet forever, it could even affect your future. For example, some jobs do a background check on people. They check the social media sites that are registered in your name. If they see the picture, they might judge and give someone else the job. The idea of being made fun and hurt your future will probably affect your mental health in a bad way.
      Another bad part of these sites are the racist or biased post of other people. Some people say very racist things about other people's cultures. They are stereotypical and judge people by what other people do. This could really make someone feel bad about their culture; they will be ashamed of their background, culture and etc. Examples of racist comments are the one aimed at Mayweather win over Pacquiao. They called him nigger and many other atrocious words. Words that could make many people feel bad.
There are many other bad parts of social media that make people feel bad about them and it also damages their mental health. There are some parts of these sites that are fun and it helps you communicate to friends but I think that the bad over weighs that good. It ca damage your mental health really badly. To conclude I think that the Social Media sites have a negative impact a child's mental health.