Interesting conclusion.

The University of Lausanne studied the 100,000 most popular sites on the Internet and came to a funny conclusion. They remember more than just what you write in messages, contact forms, or email forms. The data that you wrote but did not confirm is also remembered. That is, hypothetically, if you entered one of your email addresses when choosing a mail for registration, then changed your mind and registered for another, the site will still remember both addresses and associate them with you.