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For modern people,mobile phone is far from just a communication tool for making phone calls and sending messages,but a smart thing similar to or even better than a computer.Using mobile phones seems to shorten the distance between people and bring them closer.However,excessive use of mobile phones can sometimes cause serious problems.This article will introduce social network and its popular reasons,smart-phone users’usage of social network and other aspects so that to explain that excessive use of smart phones will re?duce human interaction and participation,and sometimes even lead to serious problems.