The 'home' link in the top left corner is hard to read due to the font colour on the background colour. Red on a dark background is bad.
When first landing on your site, I have no idea what I'm looking at. It's just random boxes with unrelated text, I guess once you have a userbase this won't matter as people will know what's what, until then, you'll need to make it more obvious why I'm looking at your page, then you need to give me a reason to stay.
You also need to explain that clicking "next n" shows you children of the current parent comment. It's just not obvious. Don't make me think.
Reading your description, this sounds like something that is just not useful. I just don't see this working in any way that will bring money in, or even attract a community.
Honestly, yet another 'web2.0' pointless app that will die due to lack of funds or users. Sorry to come accross as being harsh, but I'm trying to be honest. You should use your python skills for something that actually provides 'real' value.
Don't be too put off by me though, I'm not exactly what you'd call an 'early adopter'.