Sample quality is relative. Can always say "you should studied population X" & no matter how good the sample, it's now biased wrt that pop.
@MichelleNMeyer @seanjtaylor Contagion study random in terms of experimental designation, not random representation of Facebook. Different.
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@zeynep@seanjtaylor 700K were randomly selected by FB ID from among all who view FB in English--a rep sample of Englsh-viewing FB users no? -
@MichelleNMeyer@seanjtaylor "who posted one status update" - Show replies
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