Well In a positive way you can call 911 if there is an emergency.
In a negative way is you can get addict and it is never good to have an addiction.
they can improve your social life because of social media and you get to connect with many people or they can ruin your social life because then you will be on your phone and be so used to comunicating through texing that you will have trouble comunicating in real life and be anti social
hope this helps :)
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