Developer Vesku Hartikainen has a little "Hobby Project" of porting the popular Twitter Client Tweetian to the Sailfish OS. This is a work in progress but the basics have been covered as can be seen from below:
My code is still hackish and incomplete. I'm hoping to get it soon to good enough shape so that I can contribute it to upstream project. In the meanwhile sources of my port are available be found from my github fork under branch sailfish-port.
Source Vesku's Blog