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Could you create a PageUnrank algorithm for entities that have *lost* credibility with respect to other entities? Serious question. It seems like it would be similar. The original PR treated a link as default positive valence on average…what if it’s not for key links?
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Right and there are many offpage signals obvs but relative value based on new info hard to quantify. Can give more weight to recent signals but auto-solutions seem unreliable, as are other elements of current search algos of course.
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An entropy or enthalpy rate would be interesting. A 10 year old twitter account may have tens of thousands of followers, but how many of those accounts remain active? Some kind of social capital flow / evaporation measure.
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