Privacy and NSA's three hop query

President Obama continues to talk reform after pervasive and ongoing criticism of the bulk surveillance of U.S. citizens revealed by Edward Snowden. One of the more interesting points is the creation of a public advocate who would defend a citizens’s right to privacy in the court. Yet the administration’s defense of the current system, where supposedly limited information is seized--the widely discussed “three hop query”--ignores a basic tenet of investigative research: data trees allow the identification of millions of people in a 2-3 hop query.