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You should join the discussion on reddit:

1) Spez actually weighs in on such matters

2) the suitability of supervised/unsupervised algorithms for recommending links is discussed (note that Amazon and other highly successful recommendation engines rely upon multi-layered feedback to self-tune, hence my bias towards supervised algorithms)

3) the churn and refresh rate, along with maximization of the desirable turnover and minimization of bombing, is discussed in the context of the 'hot' algorithm and potentially useful changes to the algorithm

You might find it worth your while.

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