One could argue that opiates improve their life, in the short term at least. Therefore, in my opinion parent comment claimed that we will not know the effect of FB for another 10-20 years, and I agree. There is a lot more to us, than what we feel right now, our minds are very complicated. What if in 20 years you starting feeling depressed for no obvious reasons?
FB and social media will definitely have a major impact on the human mind. I am not sure if I find value in being friends with people from high school as my mindset has shifted so much I cannot stand people that used to be my friends. Seeing their children and vacation pictures adds no value to my life, it serves as a distraction and makes me want to "keep up with the Joneses"