The thesis of the paper is that TrustRank is fundamentally flawed by being biased toward topical communities that are over represented in the seed set of trusted sites. Topics that are overrepresented in seed sets are often commercial in nature and also focused heavily upon by search spammers. Thus overweighting those seeds may also overweight many spammy topics and spammy pages.
By using a directory such as DMOZ or the Yahoo! Directory to offer seed sites and using those directory categories to categorize topic sensitive TrustRank scores the belief is that overall relevancy can be improved, while shifting the focus away from overrepresented topics that occur in a smaller seed set.
Since using DMOZ or the Yahoo! Directory as a seed set would vastly increase the seed set size it would be impractical to manually review all seeds, so you take the top half of trusted domains (as determined by topical TrustRank) from each topic to use as seeds. Weight the seed voting power by its PageRank and let this topic sensitive TrustRank happily propagate through the web.
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