How do I know if someone is bookmarking my site?

[Useless]

Originally posted by shags
The question was ”How do I know if someone is bookmarking my site?” not how many surfer coming back using bookmark.
From favicon.ico you can see how many bookmark the site gets.

It is my understanding that IE attempts to find the favicon during every visit, regardless of whether or not the surfer bookmarks your page. Though it would not be uncommon for me to be wrong about such things. It happens.