Service Comment Posting & Moderation?

Service Comment Posting & Moderation?

Is there an option to have your service comments put on hold until you moderate them and decide wither to accept them or not? I am wanting to know, not because I plan on doing this for my services, but because I just tried to leave a comment on a service there and after clicking submit, the page refreshed, but no comment was made to it. I typed another comment on that service and clicked submit, but same again, the comment was not made.

Im thinking it is either ones of these things..

1. There is a comment moderation queue option I didn't know about.
   
2. There is an error with the service commenting system.
   
3. There is a problem with my browser.
   

One more thing that is making me think that it must be Number 1 is that I then tried to comment on a different service and it worked so surely if it was a comment system or browser problem it would happen on all the service pages.