Here is the Twitter extension I have been using in Pocket Ninjas. I hired Crazy_Ivan to create it and he did a spectacular job! With it you can send tweets from your game as well as screen captures.
The .zip file contains a manual that Crazy_Ivan put together to walk you through the integration process. One thing that isn't in the manual is for it to work properly in OS 6.0+ you have to do the following after exporting your game -
go to classes > applications > open CRunView.m
and change the "NO" to a "YES" in the section -
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
Other then that its good to go! If you are an extension developer and would like to take a stab at expanding on this extension, let me know and I can send over the source.
Again, thanks to Crazy_Ivan for doing such a good job with it!
Hope people find it as useful as I have.