There was an article about this a few years back: http://blog.linkibol.com/2010/05/07/how-to-build-a-popularity-algorithm-you-can-be-proud-of/ http://blog.linki

There was an article about this a few years back: http://blog.linkibol.com/2010/05/07/how-to-build-a-popularity-algorithm-you-can-be-proud-of/ http://blog.linkibol.com/2010/05/07/how-to-build-a-popularit... I've found, in practice, a Bayesian weighted average is easy to implement and pretty effective. It's also a good candidate for "stream" processing (i.e., calculating in a single pass)