你说的是site吧. 　　我可以给你一些thesis和antithesis啦.因为我并不赞同这个观点嘛你自己组织好了 　　thesis: 　　-communication,inter-connectionandglobalization:withsocialsitessuchasfacebookandtumbler,geographicalseparationnolongerpresentsasabarriertocommunication 　　antithesis: 　　-blurthedistinctionbetweenrealityandthevirtualworld 　　-addiction 　　-socialpressureofstayingconnected 　　-potentialforonlinebullying 　　-privacyissue:CIAtracksrecordandscansthroughaccount 　　-market:penetratingadvertisingwherecompaniesbuyprivateinformationofusers 　　well,onethingineedtotellyouisthat"whenyoupayforsomething,yougettheproduct.whenyoudonotpayfortheservice,youaretheproduct"...sobasicallyinmyopinionsocialnetworkingsitesdomoreharmthangood 　　whyit'ssopopular: 　　well,it'sanaturaltrendthateverythingisbasicallygoingonline.moreover,ithinkit'sinhumannaturetosometimesavoidface-to-facecontactespeciallywhenwe'retryingtokeepouremotionstoourselves(exhaustion/guiltyetc)