Comscore is a media measurement site similar to Hitwise or the Alexa site rankings. They do a decent job, but people are beginning to take their data way too seriously for the accuracy that their methodology delivers.
Essentially, they (like Alexa) rely on users installing software which monitors which sites they visit.
That methodology means your samples are not (and cannot be) representative of internet usage.
For instance, most workplaces, schools and colleges have policies and security settings prohibiting the installation of this kind of software. That’s already knocked out a very large proportion of internet users from the sample.
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