The same goes for categories of things. You can search for the word " car," which is not a specific thing but a type or category of thing. Google still gives you cars, whether they're tagged or not.
There's one ironic caveat to using the NSA's methods for wide-scale information harvesting and algorithmic filtering, which is that the NSA may theoretically know everything you're doing.
The NSA's domestic surveillance programs are controversial and possibly unconstitutional. But let's face it: They work.
And the NSA's methods can work for you, too.
Sign up for Computerworld eNewsletters.