How do I know if someone is bookmarking my site?

[Surfn]

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.

That only tells you for one day, which is pretty useless to me as my number of new bookmarkers vary daily. If you need to know your average number of bookmarkers for a given period then it totally worthless. I can produce hard numbers via my stats for potential advertisers.