Nowadays，it is a tendency that social network sites (SNS) become more and more popular all over the world. There are so many kind of SNSs, such as facebook and MySpace, in china we often use “Renren”instead.. The SNS have much benefit for modern people. With the help of SNS, we can make new friends or chat with strangers or make other people become more understand about ourselves. But as same as other things in the world, people have different attitude towards it. Some people think that SNS is a wonderful tool which can help people communicate, and it can make the world more efficient. Meanwhile, some people believe that the SNS is a waste of time, they said that many young people are spending lot of time doing this, they even addicted to it, and also the SNS may used by cheaters and some bad guy. Well, in my opinion, we should use it wisely, control the time we spend on it, which is more important is we should distinguish the information from SNS, make sure we will not be cheated. 本文来源：https://www.wddqw.com/doc/b0c39f8e83d049649b6658d8.html