Having separate indexes and separate searches for sub-domains of knowledge is an interesting idea. The original idea of PageRank was that each link constituted

Having separate indexes and separate searches for sub-domains of knowledge is an interesting idea. The original idea of PageRank was that each link constituted a 'vote' for a page. Perhaps different epistemic communities on the internet use links to mean different things. So, the meaning of links on technical webpages is slightly different from the meaning of links on social websites. Interesting idea to play around with.