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Re:Ask HN: Hacker news clone script in Ruby? by octopus on Tuesday May 22, 2012 @10:50AM (#4008062)
Check the source code of lamernews:

https://github.com/antirez/lamernews

You may find some inspiration there ...

Re:Ask HN: Hacker news clone script in Ruby? by jwong42 on Wednesday May 23, 2012 @05:46AM (#4012344)
I bookmarked these articles when I was trying to search for algorithms to implement in a news website that I wanted to develop as a side project. But I haven't taken a closer look at them yet. Hope these help.

http://amix.dk/blog/post/19574 - HN http://amix.dk/blog/post/19588 - Reddit

Re:Ask HN: Hacker news clone script in Ruby? by ecubed on Monday May 21, 2012 @05:57PM (#4005128)
http://evanmiller.org/how-not-to-sort-by-average-rating.html

This might be a good start. Doesn't really take time into account, but I don't see that part being too hard to add.