There's a script on the page that embeds the Rap Genius article with annotations (a new feature they just debuted), which I'm assuming you're not seeing because you have javascript turned off. The content is on Rap Genius so anyone can add annotations to it. Notice that the linked website (gambletron2000.com) is also a side project of the Rap Genius Engineering team.
All of that aside, I'm not really a hundred percent sure you can call a website's "about" page blogspam...
Ah, I feel silly now! After the first paragraph (which is all that loads), there's a friendly link that says "Read this on NewsGenius." So I really thought that's all there was to the page. I'm using RequestPolicy so it blocked the content from the rapgenius domain from loading, but usually I'm better at noticing when that happens.
Edit: I guess it's cross-promotion, which is fine just not what I expected.