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NJ5 said:

Is Alexa supposed to be serious? There might be a strong bias in their coverage, after all people have to specifically install an Alexa application which they use for tracking, isn't it?


Yes, they have to install the software to count pageviews, but that's all it does, is count pageviews. There's no bias there.  It's just a sampling of what web traffic is doing on any given day.  No one said it's a 100% accounting of all Internet tracking.