Pingsbacks should not be sent multiple times if receiving site already has it
|Reported by:||mdawaffe||Owned by:|
When WP sends a pingback to a site that already has that pingback registered, WP does not add that site to it's list of "Already Pinged" ($post->pinged). It should.
I'm not sure how edgy this is. It may happend fairly often if the original pingback was marked as spam.