> The 4th amendment is not a prohibition on collection of information about someone. It's a prohibition of violating the sanctity of your home and person to collect that information.
There's actually considerable current debate (and it will no doubt accelerate with the recent revelations) over the extent to which the "persons, houses, papers, and effects" part of the Fourth Amendment extends beyond ones physical body and tangible property, but its eminently clear that it does because the 4th Amendment is the basis of the general requirement of warrants for wiretaps, even when the wiretaps do not involve a "physical penetration of a constitutionally protected area". [1]
There's actually considerable current debate (and it will no doubt accelerate with the recent revelations) over the extent to which the "persons, houses, papers, and effects" part of the Fourth Amendment extends beyond ones physical body and tangible property, but its eminently clear that it does because the 4th Amendment is the basis of the general requirement of warrants for wiretaps, even when the wiretaps do not involve a "physical penetration of a constitutionally protected area". [1]
[1] Katz v. United States, 389 U.S. 347 (1967)