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Learnings from web ratings systems - Socialtext sinniert über Rating Systems.

Many sites including Amazon, Netflix, and Yahoo! used five-star ratings to rate content, and this pattern became very common. Sites hoped that these ratings would provide rich information about the relative quality of content. Unfortunately, sites discovered that results from the 5-point scale weren’t meaningful. Across a wide range of applications, the majority of people people rated objects a “5” – the average rating across many type of sites is 4.5 and higher.