IrecentlystudiedthisquestionusingaclassicAmericanexample:baseball.Itestedhowateam’sperformanceateveryageofourchildhoodaffectswhichteamwerootforasadults.FromFacebook’spubliclyavailableadvertisingplatform,Idownloadeddataonhowmanyfanseverybaseballteamhas,brokenoutbygenderandage.(Facebookestimateswhethersomeoneisafanofateambasedonboth“likes”andposts.)Thisdataisnotperfect,butitdoescorrelateprettywellwithpreviouspolling.AccordingtoFacebook,themostpopularteamsaretheYankees,RedSox,Mets,CardinalsandBraves;thereare1.65YankeesfansforeveryMetsfan.Facebookdatacanrevealpatternsthatpollsgenerallydonothavelargeenoughsamplesizestodetect.