judgecorp writes "MIT's Immersion project sifts your Gmail, and constructs a map of your associations. Without opening a single message, it gives a clear view of who you connect with. It's a glimpse of some of what the NSA PRISM can do. From the article: 'You can assume that if the NSA is looking at your email, the information in Immersion is similar to what they will see. Consider that they probably see all of your email addresses (and not just Gmail) and that the metadata is examined along with the metadata from everyone you’ve corresponded with, and you can see just how much can be inferred from this data alone.'"
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