| ||Is it hot or not? Ranking of user modded content.|
13 points by ivankirigin on Aug 2, 2007 | hide | past | web | favorite | 7 comments |
|Reddit and News.YC share a feature: hotness. Users mod up and down -- but hotness is more than total points.|
How should I do it?
Positive correlation with number of votes.
Negative correlation with submit time.
Perhaps negative correlation with time since mean or median time of mods.
Perhaps adjust for rates -- a surge implies extra hotness.
How do you make the front page efficiently? I hope not to recalculate hotness for each page view -- but a naive approach might think it necessary given the continuous time decay.
A parallel service could periodically troll through the entries from the past N days and calculate their hotness -- which serves the front page. That could be updated and chached in memory inependent of front pageview count.
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