James,
The JFBCSocialShare module doesn't have a way to set the default text in a dynamic way like you're looking. You could use the {JFBCTwitterShare text=xyz} tag, where xyz is the article title.
I hope that helps answer your question, but should you have other questions or issues, just let me know.
Additionally, please post from the account you subscribed to JFBConnect from. Priority support is normally for active subscribers only.
Thanks,
Alex