Using WordPress 3.5, JetPack Plugin-> Publicize to generate Tweet, Facebook update from post as it is published. Cloning new post from old imports the already Tweeted/posted update from the post, so it can't be edited to generate a new Tweet for the newly published post. Just shows the original Tweet, even though the post is now new content and should have a new url. Ideally I'd like to clone the post, update the content, and send a new Tweet when I publish the new post. Discussed this at length with Jetpack support folks, who suggest:
"The plugin seems to duplicate the content, but also the Post Status. This will indeed cause Publicize to stop working, because it will be disabled when a post has a "Published" status."