The project Immersion of the MIT Media Lab (it is an email metadata visualization tool) translates metadata from your email into a map that displays your relationships with recipients or recipients of your emails.
If you do a test you will be scared. Your metadata can tell you a lot about you. Try Immersion for your Gmail and will visualize all of your online relationships in the last 10 years.
The app scans only the From, To, Notification fields. and the date of the messages in Gmail, Yahoo Mail, or MSExchange. Scanning my Gmail account showed how many messages I have received in the last 10 years I use the service. The app detected how many partners I have and could predict how many new partners I have by the end of the year and how many messages I will send and receive the rest of 2014.
To test with your email, you must grant access to the application to scan everything that we described above.
Email metadata is easy to see, but very difficult to delete. It MakeUseOf by Guy McDowell explains how you can see them information header in Gmail messages, and how to decrypt the metadata associated with your e-mail.
You can now imagine the size of each user's exposure to Internet. If you consider that every file contains metadata, (files of Office, PDF, φωτογραφίες) μπορείτε να καταλάβετε το τι μπορεί μια κυβέρνηση ή ένας κακόβουλος user to know about you.
