Facebook stabs spam

The war on spam has failed. Though email providers like Google and Microsoft get a relatively good spam detection rate, there will never be a 100% success rate. And these guys are getting smarter.
Even Facebook were not left out, and many people get spam sent to them (check your 'other' message box...)
Well now Facebook are making a stand against spam, by charging 1$ per message to someone you don't know.
I think that's actually nice.