Each moderating team using GraphComment has to chose weither to function in pre-moderation or in post-moderation mode.
If in pre-moderation at the time of submitting a comment, you’ll see a message indicating that the message is pending validation.
You must then wait your message to be moderated by the site. If despite that your message does not appear, it means that the moderators felt that your message violated their charter.
If the site is set to post-moderation, comments appear as soon sending to the site but can then be removed.
If they are deleted, a message that this comment was removed appear instead of your comment if it has received at least one response, otherwise it just disappears.