See the dashboard- both me and McWill apparently reposted our posts there when we refreshed the page.

Spam away boys.

This bug has been known for a while. Abusing it will result in various punishments.

ohh sounds naughty. i'm excited

Well, the page does say "You appear to have submitted something this load. To stop re-submission, click here to refresh the page."

But yeah, you abuse I take.

A redirect to a 'your post has been made successfully' followed by a redirect to the dashboard with cleared headers could be a nice resolution.