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1、CrowdsourcingandKnowledgeSharing:StrategicUserBehavioronTaskcn111,2JiangYang,LadaA.Adamic,MarkS.Ackerman12SchoolofInformation,DepartmentofEECSUniversityofMichigan,1085SouthUniversityAve.304WestHall,AnnArbor,MI48109-1107,USA(yangjian,ladamic,ackerm)@umich.ed
2、uABSTRACTpress.ArticlesinWired[1]andBusinessWeek[2],forexample,repeatthesamesuccessstoriesforvideo,stockphotography,andWitkeysareathrivingtypeofweb-basedknowledgesharingmarketevencorporateR&D.However,themediacoverageconsistsinChina,supportingaformofcrowdsou
3、rcing.InaWitkeysite,primarilyofanecdotalevidenceinanoftenrelentlesslyenthusiasticusersofferasmallawardforasolutiontoatask,andotherusersmanner.Empirically-basedanalyticalstudiesofcrowdsourcingcompetetohavetheirsolutionselected.sitesare,unfortunately,lacking.
4、Inthispaper,weexaminethebehaviorofusersononeoftheThispaperpresentsonesuchstudy.ItanalyzesuseofaWitkeysite,biggestWitkeywebsitesinChina,Taskcn.com.OnTaskcn,weTaskcn.comwhereusersoffermonetaryawardsforsolutionstoobservedseveralcharacteristicsinusers’activityo
5、vertime.Mostproblems.Otherusersprovidesolutionsinthehopesofwinningtheusersbecomeinactiveafteronlyafewsubmissions.Otherskeepawards.Taskcn.comhas1.7millionregisteredusers.Usershaveattemptingtasks.Overtime,userstendtoselecttaskswheretheyrequestedsolutionsforne
6、arly3100tasks,and543,000solutionsarecompetingagainstfeweropponentstoincreasetheirchancesofhavebeenproposedinlessthan2years.winning.Theywillalso,perhapscounterproductively,selecttaskswithhigherexpectedrewards.Yet,onaverage,theydonotincreaseItmightappearthatt
7、hesiteshouldbedrowninginnewbiesandtheirchancesofwinning,andinsomecategoriesoftasks,theirlurkers;yet,thesiteappearstobequitesuccessful.Askersclearlychancesactuallydecrease.Thisdoesnotpaintthefullpicture,getsolutions.Moreinterestingly,thesiteappearstobesocial
8、lyhowever,becausethereisaverysmallcoreofsuccessfuluserswhostable:thereisacoreofuserswhorepeatedlyproposeandwin.managenotonlytowinmultipletasks,buttoincreasetheirwin-to-Thelargenumbersofnewusersensurema
