Alexa statistics self-selection skew
Alexa is Amazon’s search engine and web toolbar. The toolbar sends data about its owner’s online behavior back to the Alexa servers which compile the statistics and provide free information — including traffic estimates and popularity rankings — about virtually any remotely popular site on the web.
It is tempting to take statistics, particularly free ones, and use them for analysis, prediction, public relations, etc. Particular caution should be taken with using Alexa’s because of selection bias: toolbar users do not represent the average web user or many / most segments of web users. This has been shown by others here and here.
Alexa is entertaining and sometimes informative, but for serious statistics, consider other tools.
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