How did hackady do this?

I noticed that my youtube video http://www.youtube.com/watch?v=3unSMko8m4Q has a "comment" below the click count that states that this video can also be seen at hackaday. This is not a standard comment but obviously something special. Has anyone here an idea how this kind of comment is created? I am asking because I want to have a similar comment for all of my videos but pointing back to my blog. I googled around but obviously I am searching for the wrong keywords. Is there anyone here who knows how to implement this?

I think it is explained here:- http://youtube-global.blogspot.com/2011/06/as-seen-on-youtube-pages-celebrating.html

Hmm, I see. So probably my website is not considered a "web feed". Has anyone an idea how I can publish a "web feed" with wordpress.com?