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I tried http://astroclimatology.wordpress.com/wp-admin/options-discussion.php but it didn't work. I do want unregistered users to be able to comment.

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What I dont want is email notifications like this:

New trackback on your post "we also analyzed zonal wind too" Website: Quora (IP: 107.20.3.229 , ec2-107-20-3-229.compute-1.amazonaws.com) URL : http://www.quora.com/Planetary-Science/How-can-faster-rotation-rate-lead-to-an-increased-pole-to-equator-temperature-gradient-when-the-zonal-velocity-of-the-jet-stream-decreases-as-predicted-by-both-t Excerpt: How can faster rotation rate lead to an increased pole-to-equator temperature gradient when the zonal velocity of the jet stream decreases, as predicted by both the Held-Hou model of circulation and one of the CAM3 simulations that I ran?...

Supposedly, faster rotation rate means a stronger Coriolis effect, which means that a tropical parcel of air that goes poleward in the meridional direction is more likely to be deflected in the zonal direction. Yet, the Held-Hou model of circulation pr...

You can see all trackbacks on this post here:

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If you uncheck the box "Allow link notifications from other blogs (pingbacks and trackbacks)" I think will solve your problem –  setatakahashi Feb 28 '12 at 14:38
    
Close-voted as off-topic. Questions about wordpress.com support are explicitly out of scope, as per our FAQ. –  Chip Bennett Apr 6 '12 at 17:09
    
Normally, I agree with Chip on this. But since it's the exact same answer whether you're on .ORG or .COM, I will only close this if several other people agree as well. –  EAMann Apr 27 '12 at 17:33
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2 Answers

up vote 3 down vote accepted

Go to your site's dashboard. Then navigate to Settings » Discussion and disable the "Allow link notifications from other blogs (pingbacks and trackbacks)" option:

Trackback Option

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This loop disables trackbacks completely, just needs to be hooked...

foreach ( get_post_types() as $post_type ) {

   /* remove all trackbacks from any post types */
   remove_post_type_support( $post_type, 'trackbacks' );
}

Or just disable trackbacks by default...

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1  
This doesn't work on wordpress.com, where you don't have access to the Wordpress files –  setatakahashi Feb 28 '12 at 12:51
    
You still can disable the "link notifications" by default ... and might have to remove them manually from any previous posts. –  syslogic Feb 29 '12 at 18:59
    
I'm sorry for not having provided the button-clicker version :) –  syslogic Sep 28 '12 at 23:24
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