Besides, spreading Justin Biber love and cat videos, social media is also good for uncovering the truly stupid people in life.
Some people see this as a negative thing. Personally, I like to think positively about such things because while a person may fool you into thinking they are a smart and thoughtful, with common sense in a traditional social interaction, their social media profiles will quickly show you if this is true or if you are dealing with a stupid person. This then saves you the time of making friends with people whose judgement is clearly questionable and will not make reliable friends.
(Sidebar, the definition of “stupid” that is relevant to this post is a person who lacks common sense and/or tends to make poor decisions or careless mistakes.)