The CIA has just made a sizeable investment into "Visible Technologies" a company that writes software that monitors social sites, blogs and websites that get loads of traffic, like Youtube, Amazon, Flick'r, Twitter, etc...
But then again "turn-a-bout" is fair play - "Wikiscanner" is a small company that monitors "edits" made to Wikipedia by the CIA, Vatican, various governments and news organizations...
It's nice to know that in this day and age even the "spies" are being spied on (even they need to be monitored...)