Flic.kr links recently began appearing on Twitter and around the web, so I did a little bit of digging. Twitter has brought about a wild storm of URl shortening services, and some issues surrounding them. James Duncan Davidson has a good summing up of these, and some of the solutions.
One of these solutions is to use a link tag on a page to give an alternative short URL. Flickr has started to support this, as so…
On a photo page, say http://www.flickr.com/photos/douglasfshearer/3447346323/, we find in the source:
This also works for user accounts, as an example, mine would be http://flic.kr/douglasfshearer.
The short photo URL is the photo ID converted to Base58, so you need to turn one into the other.