I like the concept but when I tried it out it didn't bring up anything interesting. It seems to have a heavy bias towards 'mainstream' news sites, which I rare

I like the concept but when I tried it out it didn't bring up anything interesting. It seems to have a heavy bias towards 'mainstream' news sites, which I rarely like to read. It seems like it is totally missing out on the 'long tail' which IMHO is where most the value in a service like this lies. The bubbles showing my 'interests' at the beginning looked quite promising, so perhaps there is some tuning that could fix this (maybe even user configuable?).