I think that it depends on the app you are using and how you use it. In my class at school most of the people there are on mostly Snapchat and Instagram (I'm on both), and no type of bullying has occured to them as far as I know. I'm only friends with people that I know of on Snapchat, and Instagram is the same. I used to be on Facebook, but I hated Facebook so much because of all the ads and the pedophiles there, so I got rid of that. All in all, I think most teens are safe, if they use it properly.