If you have been blackmailed, is it likely that the blackmailer is a person who you know?

I recently received a blackmail in the "spam filter" of my gmail account. I am asking this, because the real question is "how can the blackmailer know your email address if you have not ever met him personally?". The blackmailer claims that he has tracked me visiting adult sites and made a... show more I recently received a blackmail in the "spam filter" of my gmail account.

I am asking this, because the real question is "how can the blackmailer know your email address if you have not ever met him personally?".

The blackmailer claims that he has tracked me visiting adult sites and made a video of the website I viewed and saw me through the camera.
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