The National Security Agency says its massive new data center near Salt Lake City will enhance the agency's ability to analyze the email, text message, cellphone and landline metadata it collects. Rick Bowmer/AP hide caption

itoggle caption Rick Bowmer/AP

An MIT analysis of Larry Abramson's Gmail account illustrates his online relationships. immersion.mit.media.edu hide caption

itoggle caption immersion.mit.media.edu