Tw*t
This is not the dawn of the classless society where everyone shares everything with everyone else. It is, in fact, the dawn of a new type of class system based around how socially aware you are. Socially aware people do NOT share everything with everyone, because they are smart enough to realise that employers or prospective husbands / wives or even insurance companies know how to use the internet and will discriminate against you on the basis of what you do and say. Socially ignorant people do not stop to think before they post sensitive information about themselves on-line and are destined to a more dificult, more lonely, more expensive adult life as their idiotic teenage transgressions and early adulthood arrogance dogs them until their deaths.
So, when I get the promotion my more highly qualified colleague deserves, and when I get to marry the girl of his dreams even though he is better looking and funnier than I am, it will be because I didn't post some stupid right-wing racist rant on some crappy social website, or because I've never had any members of EmoSlut.com on my networking site's friends list.
Zuckerberg is clearly about as socially aware as a paving slab and only has any success in his life because he was lucky enough to stumble across a great idea a few minutes before some other dotCom start-up dweeb. There are a million more Zuckerbergs tearfully wanking themselves to sleep in their parents' spare rooms as we speak.
p.s. The REAL money is going to be earned by those who figure out a way to remove all that freely shared private stuff from the interwebs.