there's a interesting phenomenon. imdb.com used to be the granddaddy of movie review/rating site. (it originated in 1980s from newsgroups, later somehow acquired my amazon) Wikipedia article on movies used to refer to it for ratings. But since few years ago, it started to also use Rotten Tomatoes and Metacritic. Today, it doesn't even mention imdb's rating at all.

For example, see http://en.wikipedia.org/wiki/The_Hunger_Games:_Catching_Fire#Critical_response

i am not familiar with Rotten Tomatoes nor Metacritic. Does anyone know why Wikipedia started to use them and not even include imdb? (preferably, if anyone can point to a policy page on this, or a discussion)

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