I came here while looking for most interesting Anna Nicole Smith pics on Flickr.
Flickr shows you how many times a particular photo has been viewed but it won't tell you how people discovered that photo - whether they came via search engines, Flickr sets, tag search or through some blog.A Flickr user has found an interesting workaround to this problem - now when you write a comment on some Flickr photograph, you can automatically add a line saying how you found that photograph on Flickr.
Just drag-n-drop the URL above to your browser favorites toolbar. When you leave a comment on Flickr, click the above favorite link on the toolbar and it will automatically add information about how you found that photo.
Source: Flickr Hacks | Add referrer into comments