Gmail Contacts

When you use Gmail, all of the people you send mail to and receive mail from, as well as all the content you send or receive, is fed into Google, allowing them to extend your social profile a great deal. If e-mails you send or receive contain web links to a political event or to a dating site, this tells a great deal about you, as do the people you are in touch with and, including the interests and preferences of those people.