So, Known lets you share links via a share API (and a toolbar bookmarklet). In the later versions of it, this action also calls a link shorten event hook which allows a plugin to shorten the shared URL.
Because I often share links, I wrote a quick plugin to hook into my bit.ly domain.
Using the plugin
Install and activate the plugin in the usual way, and then in your admin panel add your generic access token to the input box on the bitly page. Generate this token from your bitly settings page.
Currently you can only have one domain per Idno install, basically because I was short of time and so didn’t do the full OAuth thing.
So much to do, and so little time. Have fun!