Author of Blog Quest here, good point, I'll track that as a feature request. I'm open to ideas on how the filtering should work. I could roll-up feeds for each domain (hello public suffix list), but I don't think that works well for home-dir style hosting (example.com/username). Maybe the user can set a policy to filter out or roll-up certain domains?

Deduplicating RSS and Atom makes a lot of sense too.

Thanks for trying it out!

Yeah - for a lot of people deduplication would probably make sense. I have - for example - four feeds on my private page (blog posts, quotes, photo-galleries and a roll-up feed containing everything). So whenever I post anything, two of those feeds get populated. But I wanted to give people the option to only subscribe to the categories of content, they are interested in.