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Collaborative Filtering

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Slashdot popularized the idea of harnessing the preferences of the site's readership to vote articles up or down and (in theory) bring the highest quality articles and comments to the surface while burying the worst.


People need help finding the best contributions to online commnunity.


Use when you've got a large base of contributors and a wide range of quality.


Enable authenticated users to vote up or down, or otherwise rate content. Optionally give users with higher reputation status more privileges to highlight or hide content. Aggregrate the votes and use to determine sorting and display order.

At Slashdot, only comments above a rating threshold are displayed automatically in the thread. A reader can still expand a hidden comment to read it, or change their preferences to move the threshold.


The collective wisdom of the community can help filter out the best contributions and conversations.

Related Patterns

As Seen On

  • Slashdot
  • Kuro5hin
  • Yahoo! Answers