Search limits, not just on interests, but on all searches. Or (she says, dreaming big) facets. Mmm, facets. So if you get an interest search for "Doctor Who", the breakout facets could be geography, other interests, communities or users, etc.

Possibly as a paid user feature? Faceted searching as a paid feature -- man, I would pay for it. On the other hand, I am a search nerd. (See icon.)

I'm not sure how we would implement that. Bring in Lucene and SolR?

Possibly I should stop dreaming this big.