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Summary
Genealogies are likely the first, centuries-old “big data,” with their construction as old as human civilization. Recent renewed interest led to the largest genealogical websites (Ancestry.com, MyHeritage, and Geni) amassing 130 million users who generated billions of online genealogical profiles, offering ample research opportunities that would otherwise require extensive recruitment. On page 171 of this issue, Kaplanis et al. (1) showcase the research potential of this type of crowdsourced data, studying genealogies based on processing 86 million public Geni profiles.
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