The following message is displayed after a user posts a new question on the forums:
"Great!, Your question added successfully."
You shouldn't have the comma after the exclamation mark. I wasn't totally sure about this so I looked it up and this page confirms it:
http://www.cliffsnotes.com/study_guide/Use-of-the-Exclamation-Point.topicArticleId-29011,articleId-28983.html