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Second. the nsa does it, the post reports, to find unknown associates of people it's targeting for surveillance. >> let's say they're interested in tracking somebody here by the red dot. as that person moves around a path, a certain number of people are going to be following the same general direction. as they move, fewer and fewer people are going down the same exact path. and say fewer people are there and by the time they get to one other location, there's only one person who has been travelng the same path, the green dot right there. >> and they can track when two people arrive at the same...

No, sir. >> darren kavinoky, what was the point of that? what he was he trying to get out of him? >> well, it's where exactly you draw the line between something that is just innocent conduct of preserving the safety and sanctity of the neighborhood versus where it becomes this tracking somebody, which is, of course, the prosecution's theory of the case, that zimmerman was actually a predator that was hunting down trayvon and so what o'mara is trying to do is take the wind out of the sails and candidly he did a very effective job in my view. you raised the point earlier, brooke, which i think ...

Fox, information pulled from sites like facebook, twitter and the blogs could be cross-referenced with other databases to identify potential threats, even individuals, that information could lead to more video surveillance in your neighborhood. >> even where you are talking about published information. you know, information people intentionally put out there on the internet. we still have a right not to have that monitored by the government. you know, the government really doesn't have any interest in tracking somebody's twitter account if they are not really doing something wrong or suspected...

And i'm not sure w as a country have really addressed that question. when you're dealing with known foreign terrorist organizations and known jihadi sympathizers and known terrorists, to me, that's a cut and dry kind of case. >> reporter: under the proposed program, open source data -- information in the public domain -- can be gathered from facebook, twitter, myspace or the blogs. if suspicious information was picked up on, let's say, a blog, that information could be cross-referenced with other databases to help identify an individual or group, and that information could be passed on to secu...

And the blogs and under one scenario if suspicious information was picked up let's say on a blog, that information can be cross referenced with other databases to help identify you. that information could be passed on to security cameras in your neighborhood according to the aclu. >> even where you're talking about published information, you know, information people intentionally put out there on the internet, we still have a right to not have that monitored by the government. the government really doesn't have have interest in tracking somebody's twitter account if they're not doing something...