http://bkg5ofjslnbyqvu55sjonpdyp3wmfsgq23u7vpk3wxn7ewgdeocpgwid.onion?page=article&article=Understanding+Metadata%3A+How+It+Can+Compromise+Your+Security+and+Privacy.html
This information, while not revealing the substance of your communication, provides valuable clues that can be pieced together to form a larger picture of your activities, associations, and habits. Why Is Metadata a Security and Privacy Risk? Although metadata doesn’t contain the message content, it can still pose significant privacy and security risks.