Well, you should focus on the main points. Try to brainstorm what you know and pick the strongest subjects with the most evidence.
Here are examples of a few. In your intro, only use about 3 or 4 that you will actually have time to talk about in your essay, though.
-Increased anxiety
-Triggers eating disorders
-Cyber bullying
-Spending more time on phones causes eyesight impairment
-Promotes consumerism
