Quantcast, Compete, comScore Offer Differing Views on Facebook's US Traffic

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Web analytics firms Quantcast, Compete, and comScore have all recently released updated numbers on Facebook’s US traffic, but they each differ from each other and from Facebook’s self reported numbers. Why? Each service uses different methodologies with different strengths and weaknesses – usually based on some combination of self reporting, ISP reporting, and panel sampling – but together, we can use them to triangulate trends in Facebook’s actual US traffic.

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