It can cause physical harm because of people pressuring others to do dangerous activities such as robbing, killing, stealing. Emotional harm due to mental stability of if they don't do this activity they are not worthy.
Something that could cause someone to use social media may be the excitement of being in contact with different people around the world, or seeing funny memes, or videos, but cyber bullying can cause many to become depressed, people can be ruthless and bully one for their appearance, race, sexual orientation, religion, financial state, clothes, disabilities, etc.
At least 2 fruit servings a day
Physically speaking if one had High self-esteem and a positive outlook you would presume that the individual would be less stressed leading to:
Less chance of heart diseases
Weight loss
more energy
better memory
and the list continues
-hope i helped <span />