I wasn't aware of these type of URL shorteners (paying) thanks everyone. Looks like I've got some research to do. I've had various websites since the mid-90's and still this is the first I'd heard of this.
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Facebook are silly. When you click on some short URLs, you will only see a screen warning you for suspicious link and not to proceed, or Facebook ask the user if the link is "spam" or "not spam", the user has to decide and answer the question by pressing the selected button. But how can the user know if a link is spam or not before allowing to visit or see the link first before answer the question. And when the user replied as spam link, facebook may rely on that feedback to ban or block a short url domain. Facebook, if you want to ask the user if the link is spam or not spam, pls ask only after the user has the opportunity to view the page first !