post permissions in control panel

I would like to suggest a section in the admin panel that allows the option for all posts to be accepted by admin instead of automatically being posted. This option would only be an option though. in other words you can either set it to letting the posts be posted automatically or you "as the admin" can choose to allow or disallow certain posts.
The reason i suggest this is due to amount of spammers increasingly using hyper linked posts to redirect members to another site or forums. i strongly feel that this would be a great security function. Also would be a good way to stop people directing you to phishing sites