[jkap]

I believe reddit's gives newer posts more points, rather than taking away points from older posts.

I might be wrong, though. It's been a while since I've looked at that part of the code.

[ecesena]

Mmm... not so sure. One of the nice features of reddit's algo is that it doesn't require to evaluate the score based on the current time, as this one. http://amix.dk/blog/post/19588

There are also a few similarities like max(abs(points+1),1), log base 10...

[dmragone]

That's pretty much how it works (as explained by reddit co-founder Steve Huffman in Udacity 253 course - sorry I forget exactly which video he says it).