As you know, the NSA domestic spying program is on-going. Does it leave behind detectable traces when it shifts through a web site -- say, a website devoted to anarchist materials? It sure does, that is, if you've got a program or service that records and displays the hosts/servers that have been used to access such a web site (it isn't hard). Just a few days ago -- after, we should add, visits from the military's CIFA and the CIA -- our program recorded a visit from "jadenova72.ncsc.mil." During that single visit, the person/robot only accessed a single KB of information.
If you do a Google search, you'll find that NCSC stands for National Computer Security Center, which is operated by the NSA, but you'll find absolutely nothing for "Jadenova72." (Typically NSA servers have more interesting names, things from classical mythology, etc.) As for only pulling 1 KB when the minimum for a single web page is 4 KB, our explanation is that the data-gathering NSA robot is searching through the code, not the text that is actually displayed, looking for certain words/combinations of words.