This exactly the issue. Anyone with common sense knows that social media have many negative effects, attention span, negative beliefs and ideas, addiction, etc. Just like inhaling smoke into your lungs can't be healthy right? But then comes so called scientist who say well since we thought the the universe was Euclidean but now we see it is non-Euclidean what is common sense is not common sense, there is no common sense. We need some sort of impossible proof to what was originally common sense.