From the Flickr Blog:
“Stats, stats, baby!
We’ve introduced a new feature for our pro members: stats!
No, your eyes aren’t deceiving you — we’ve launched another of our most often requested features. Yay!
We’ve designed stats on Flickr to give you all sorts of insight into how people arrive at your photos. If you’re a pro member you can activate your stats now.”
If you haven’t done it already, you can head on over to here to activate them!