Being social is all about disorganization, spontaneity, creativity, breaking out of all the stupid taxonomies that we impose on other people and have imposed on us. Trying to organize socialization to the extent that a "social graph" can be created is a profoundly sociopathic act. To push this task on users so that they do all the shoeboxing and tagging and linking, all in the name of "fun," requires some coercive force. It is no surprise that many Facebook users say that they don't really enjoy using it, but they have to. Part of that was the site's smart choice to maintain real names, so that you are always fretting about your online appearance. It's not a "perfectly synced representation of reality," but it is presented as such, almost like your own personal Wikipedia page, and by the laws of social anxiety you are compelled to check up on it! Shoebox, tag, link...
The line about Facebook rarely producing creative or original material really hit home for me. 4chan and SA are creative because they are fundamentally disorganized, and this freedom produces real moments of brilliance (and plenty more of profound stupidity). Facebook and its ilk are like corporate jobs disguised as consumer web products. You are constantly being shuffled from box to box, task to task, and the blinders have to be tightened ever so constantly to keep you from realizing why what you are doing really never will be "fun" in the way that a raucous party is fun.
About those blinders: those are in a big way the "privacy options" that every social network touts. Maciej points out, and I think that it's a salient point, that if everybody was able to see the whole social graph, it would dissolve. That alone should suggest that the social graph is an unnatural concept. Yet there is somebody, the owner of the social network, that can indeed see the entire graph, and there is a whole level of misdirection that they must apply to make this seem completely normal.
Again, maciej said most of this better than I could, so I'm glad he did.