Just now I accidentally pinged some several trackbacks of old entry of mine to PPS. Let me clear things out, I was in the middle of importing RSS feeds from my old blog to my current one. And I forgot to clear the URL trackback field which I usually put the trackback links to PPS. Therefore I want to apologize for all the trouble that I caused and promise that this kind of thing shall not happen again in the future.
More info about the import of RSS, refer HERE…thank you