Recentyearshavewitnessedadelugeofnetworkdatapropelledbytheemergingonlinesocialmedia,user-generatedvideocontents,andglobal-scalecommuni-cations,bringingpeopleintotheeraofbigdata.Suchnetworkbigdataholdsmuchcriticalandvaluableinformationincludingcustomerexperiences,userbehaviors,servicelev