2012-10-05 UTC
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sandeepshetty " In short, we have found 99% of all trackbacks/pingbacks to be SPAM. This is the reason why we have disabled it entirely. It is not worth the time to moderate a lot of SPAM like this." -http://www.wpbeginner.com/beginners-guide/what-why-and-how-tos-of-trackbacks-and-pingbacks-in-wordpress/