I've always thought their main intentions would be topical pagerank and author pagerank. Obviously Google have made many leaps with natural language, but measur

I've always thought their main intentions would be topical pagerank and author pagerank. Obviously Google have made many leaps with natural language, but measuring 'intent' and inherent trust is still an unsolved one. Google+ may have solved it. I remember hearing about an "author rank" type patent. All the same, the link graph has been truly bastardised because of it being such a prominent facet of ranking for an audience.