More of a UX suggestion, but I think you need to explain the purpose and why of the site better. If it wasn't for your statement on here about what the site is meant to be, it would have been even less clear to me. What is the value proposition?
The 'What's This' tip links and the 'About' section aren't working.
Under the choose your algorithm sections, when I select one of the choices it highlights the choice, but nothing else changes. This leaves me unsure if they are not working or if I am doing something wrong.
There are also a lot of people out there who might not be familiar with the term algorithm, even less understand what they actually mean. If you are aiming to reach 'normals' it might be helpful to use more common language like filters instead of algorithms.
Same thing with the copy where you describe the algorithms. To me, it seems like you are describing more how the algorithms function...rather than how it will effect what I see as a user. I'd say figure out in plain, concise language what the benefits of each 'filter' are to the user.
Terms like renewal rates, site voting power, and slow rate change don't convey to the average user how each filter effects them. I think a good place for including and describing these terms is probably in the 'What's This' tool tip for that section.
I'm not sure what the purpose of the 'State of Social Media' section is. What does that mean for the user? Why is it important to the user? What exactly does that information tell me?
The site source labels do look like buttons as tjpick mentioned. But I would also add that the Reddit and Tweetmeme labels look/are the same at least for background color. When I scroll the page almost all of the submissions are from Reddit and Tweetmeme, except for one for digg. Since the green is so much more pronounced than the grays used on the other two, I feel like it is highlighting it as something special I should look at or click. I would use the gray background color for all of them, and just use different colored font(maybe with a more pronounced font so colors(sites) are easily distinguished).
The gray description text is hard for me to read, in that I actually have to try and focus on reading it. The submission time and user are highlighted which usually signals important information in context to the info around them. Is that the important information you want to highlight? Seems to me like those are second or third tier pieces of info, where text like the description, site source, etc., are actually the important/useful parts.
Need a footer. Footer makes it clear that this is the end. Right now it looks like the page just hasn't loaded entirely because I was expecting to be able to go through multiple pages.