In the Age of Terror, the issue of data retention and government surveillance has become of paramount importance. In Data and Goliath, security expert Bruce Schneier shows just how frighteningly meaningless the notion of privacy has become. Your cell phone provider tracks your location and knows who’s with you. Your online and in-store purchasing patterns are recorded, and reveal if you’re unemployed, sick, or pregnant. Your e-mails and texts expose your intimate and casual friends. Google knows what you’re thinking because it saves your private searches. Facebook can determine your sexual orientation without you ever mentioning it.