Are you having a Tablet PC or a computer having touch screen? Here is one of the best Facebook Client for desktop with touch screen.
InTouch is a cross platform desktop client that can help you in communicating with your friends on Facebook stream by the help of touch input of your fingers or by very simple indications of a pen.
InTouch gives you an opportunity to post links from the web such as YouTube videos or for posting photos and tagging friends in your Facebook profile. For this purpose, you just need to drag and drop the required contents from your desktop or from the browser into the software window.
Basically, the InTouch is designed for Wacom tablets but it can also operate on any other OS such as Mac, Windows, and Linux etc. if it Adobe AIR installed in it.
So try this out and enjoy Facebook with a new touch screen experience!