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Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

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Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#21
post #12

Earlier quoted context omitted.

Thanks for reading the post. What do you think is wrong with the del.icio.us formula?

You just demonstrated one of the coolest things about posting at news.yc. You never know who you're gonna run into. Even when they're replying directly to you. edit: Hint, click his name...

[deleted]

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#22
post #13
post #12

Earlier quoted context omitted.

You just demonstrated one of the coolest things about posting at news.yc. You never know who you're gonna run into. Even when they're replying directly to you. edit: Hint, click his name...

:)

This is why I love Hacker News.

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#23
post #10
post #9

Yippee! Thats great. But how did u findout delicious's and stumbleupon's? By reverse engineering technique... like... Were these found out(or guess-worked) by constantly keeping track of the ranking of content? Joshu, i think the del.icio.us formula is right, or they might just be using a different time constraint than 1 hour(maybe 2hrs or anything else). Because to findout what's popular they dont require any comple…

I would trust user 'joshu' on matters related to del.icio.us.

Yeah, Jax. You know, he might just be the founder of it.

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#24

For reddit, this is the public algo released with their code. I think we should not assume that's the algo they use on reddit.com. Think about it: they could easily release a basic algo and keep the good one for their own internal use. At the very least, even reddit's blog post announcement of the code mentioned they're not open sourcing the spam detection code. Surely that's part of the ranking algo in that it deter…

It really doesn't get much better than (p - 1)/t^n, where n is larger if you want age to be more of a handicap.

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#26

For reddit, this is the public algo released with their code. I think we should not assume that's the algo they use on reddit.com. Think about it: they could easily release a basic algo and keep the good one for their own internal use. At the very least, even reddit's blog post announcement of the code mentioned they're not open sourcing the spam detection code. Surely that's part of the ranking algo in that it deter…

I don't think they'd bother trying to fake people out by releasing a different ranking algorithm than they used on the site. There wouldn't be any point anyway. Knowing how to get onto the frontpage of a venetian-blind site like Digg might be useful to spammers, but knowing the ranking algorithm of a bubble-up site like Reddit or News.YC wouldn't help them much.

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#27
post #10
post #9

Yippee! Thats great. But how did u findout delicious's and stumbleupon's? By reverse engineering technique... like... Were these found out(or guess-worked) by constantly keeping track of the ranking of content? Joshu, i think the del.icio.us formula is right, or they might just be using a different time constraint than 1 hour(maybe 2hrs or anything else). Because to findout what's popular they dont require any comple…

I would trust user 'joshu' on matters related to del.icio.us.

God!

Gojomo, is that really Joshua, the founder of Delicious and Memepool? I just guessed it when u mentioned the username in single quotes. ;) I wouldn't talk a word abt the algo then. :D

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#28
post #11

Use of true clock time in these formulas penalizes posts that are submitted at low-traffic times. Using a virtual clock, such as a tick count based on traffic (number of other submissions, votes, pageviews, etc.), could adjust for this.

Good observation. I believe a similar concept is used in high frequency trading (in markets such as foreign exchange). So derivatives are not dt, but du where u is a surrogate for time in ticks.

Re: Reddit, Stumbleupon, Del.icio.us and Hacker News Algorithms Exposed

#29
post #27
post #10

Earlier quoted context omitted.

I would trust user 'joshu' on matters related to del.icio.us.

God! Gojomo, is that really Joshua, the founder of Delicious and Memepool? I just guessed it when u mentioned the username in single quotes. ;) I wouldn't talk a word abt the algo then. :D

click on 'joshu' 's user name.
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