Greg Linden reports that Google has switched the algorithm they use for YouTube’s recommendation engine from their own to a variation of Amazon’s algorithm that was designed in the late 90s.

To achieve this, in many parts of our system we are not only optimizing for accuracy, but also for diversity. Do you use Netflix’s recommendation engine – or others like it on sites like Amazon?

There’s a recommendation engine at every digital turn, powered by a finely tuned algorithm that suggests what you should watch, buy, or read next.

Digg's recommendation engine goes live Site aims to expand social network and give upcoming stories a little more attention with new recommendation engine.

Artificial intelligence is finding increasingly novel applications, so it's no surprise to find out that Pandora used it to build a better recommendation engine.

Rubber Ducky Labs, a San Francisco–based startup, is looking to make it easier for teams to debug, analyze and improve their recommendation systems.

Recommendation engines should be varied and adapt quickly to new trends, with the ability to scale up quickly to process more data.

—iLike. Purely algorithm-based utilizing only data from other iLike members. Service is meant to be embedded in a widget, not a full-fledged recommendation platform across an entire music service.