Check out your six degrees of separation
Ever wondered just how many people have seen that email that you just forwarded? Here's a website that can show you your six degrees of separation. It will map your friends, their friends, and their friends friends.
To start mapping your six degrees:
Check back regularly because as your friends forward on the email your own map will continue to grow. Once you have friends on your map you can add yourself to the Do I Know page where other people can see if they know you through all the people in the database.
Normally it only takes a few minutes to process your email. If your email address doesn't bring up a map check out the "Problems?" page.
As a courtesy please remove any forward headers before you send the email. There is nothing like the joy of scrolling through pages of junk to find the message.
P.S. Don't forget to include email@example.com in the To: or Cc: field when you forward this email to your friends.