few years back had a visit from a bunch of police guys. They never shown any warrant, said they were looking for some guy who i have no idea about, they checked our apartment and left (5th, ie. don't talk to the police, 4th amendment, etc... - it looked so laughably unapplicable in front of these towering and pushing forward guys (and i'm 6ft btw)) What was it about - have no idea, may be they were really looking for that guy, at least that is my hope and my desire to believe in. I'm an immigrant, with clear record, official record i mean - what they have in secret files about me - have no idea.
Wrt. the topic of this discussion - FBI/NSA/etc... have been monitoring what people have been checking out in libraries, so it is only natural that they continue doing it on the Internet. Of course that is blatant violation of 4th, yet citizens of this country through their elected representatives have been strangely content with it.