Art you mentioned about people posting and tweeting every 5 minutes on social media , we see this all the time (well my wife more then me , but she shows me things ) we are on face book by name only (being signed up ) this way she can keep up with what others are doing that she knows .
Actually to me their is more bull crap then anything , monkey see and say monkey do , people all trying to impress or out do each other one monkey hits the like button a 300 more monkeys hit the button to !
we don't even have our picture on it .
I think with face book and social media sites one person said it best "THE WORLD IS MERLY A STAGE AND IT'S PEOPLE , THE ACTORS ! WILLIAM SHAKESPEAR .

And on that final note for all the many lies, half truths , bull ect. that people post on face book and as good reference as to why .
http://www.bing.com/search?FORM=UP97DF&PC=UP97&q=nasasistic+face+book+users&src=IE-SearchBoxFacebook Study Finds Narcissistic Users Spend Most Time On Site
http://www.huffingtonpost.com/2010/08/25/facebook-study-finds-narc_n_693719.html