According to the U.S. National Institutes for Health, meanwhile, the incidence of narcissistic personality disorder is nearly three times as high for people in their 20s as for the generation that is now 65 or older — 58-per-cent more college students scored higher on a narcissism scale in 2009 than in 1982. These trends strongly correlate to the rise of online connectiveness.
The connection between this and social networking should be evident: More people can say what's on their minds to more people than ever before. And most people think little and express themselves worse.
By the way, I agree with all but the last of the predictions that conclude this piece.