A Visualization of Everything Gmail Knows About You and Your Friends
When Google hands over e-mail records to the government, it includes basic envelope information, or metadata, that reveals the names and e-mail addresses of senders and recipients in your account. The FEDS can then mine that information for patterns that might be useful in a law-enforcement investigation.
What kind of relationships do they see in an average account? Researchers at MIT Media Lab, have developed a tool called Immersion that taps into your Gmail and displays the results as an interactive graphic.