Nice to see some similarities to what we have done at
http://utopic.me/The news board seemed 80% from one source, BBC. Would love to see more variety. Did not really understand your rating algorithms there. Clicking on the news opened just 1 sentence of the news item. Either redirect to the full webpage or use full text scraping like Flipboard/Zite do (keeping of course copyright in mind).
Some objects you have don´t have photos and then the headline jumps to the top of the object, which is distracting.
After registering, I now have just an empty page under my first board, saying no threads found. Not sure what I should do next.
Good luck - better (big data) content discovery & personalization projects are always needed. And try to find a specific niche - it´s a very tough and coverrowded market.