Flickr Pro's Get Referrer Stats
Pro account holders at Flickr (Yahoo! property) are able to get insights into the ways that people are finding their photos.
There are stats available for people surfing on Flickr itself - where the referrer is flickr.com - and stats about people coming from other websites. We can show you the sorts of things people search for on search engines where your photos turn up, and tell you how many views your photos have in a week, or for all time.
Flickr will be showing Pro account holders an "all time" view counts going back to when the account was created, but only a few weeks of referrer data is available until statistics are actually enabled within the account. Users that upgrade to a pro account will have 28 days of statistics. Flickr will update the stats once a day.
Account stats currently come free with a $24.95 one year account.