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The Survey2000 Project is the largest and most comprehensive Internet-based social science survey to date. Along with generating interesting data about geographic mobility, feelings of community, and culinary, literary, and musical tastes, the experience of operating a survey with Internet tools has set into sharp relief important methodological issues of sample size, representation, and generalization. The authors argue that Internet-based survey research can yield meaningfully comparable data about both Internet users and larger populations.
Witte et al. (Mon,) studied this question.