I searched and saw 2 threads referencing add-ins, but one is no longer here... and the other has 1 star saying it doesn't work.
What can be done? This is a terrible 'miss' in the functionality, IMO. It's pretty easy for a spammer to post links and there is no way to set up a user such that they cannot post links until they promote into the right user group (from what I can tell).
Any advice or [hopefully] I am missing something?