True, and Barr's idea is not actually far off; Facebook and other social networking sites are intelligence goldmines, linking people to aliases, groups, network

True, and Barr's idea is not actually far off; Facebook and other social networking sites are intelligence goldmines, linking people to aliases, groups, networks, and a lot of other things. Think of how hard it may be for a fugitive to retreat to a trusted safehouse when he's published a list of everyone he's ever met on Facebook via the Friends list, and/or named the handful of people he hasn't friended in a status or note. The CIA has shown interest in Facebook's database for a long time, because, besides the normal detective work a normal detective can do if he reads through a Facebook page, if you get a handful of real mathematicians working with that dataset, they can certainly rig something up that would at least return really interesting results.