If you look at the bio of the submitter, he writes for ReadWriteWeb and, I believe, wrote the article. Nothing wrong with that; people often submit their own work here.
You are correct. I write for ReadWriteWeb, wrote the article and I think that the URL has that code in it because I clicked on the Hacker News button on the article to share it.
:)
Perfectly good! I have no issue with it, I just thought it was worth pointing out as I had seen the same URL tweeted.