Who Decides Standard 标准由谁而定

Weibo has been the most popular communicational tool. People use it to scan news and a lot of them like to make comments about the hot issues. Especially when the negative information has been delivered, people will criticize the people who did the bad things at first, but as more details has been exposed later, people start to change their opinions. So I always wonder about the public's value conception, as they change their opinions so quickly, which seems that they can't make their own judgment, and the media affect their decision all the time. So it is important to let the teenagers learn what is right and wrong, or they will follow the crowd easily. 
微博已经成为最流行的通讯工具，人们用它来浏览新闻，也有很多人喜欢在上面对热点发表评论。尤其是负面信息发布后，人们一开始会批评做错的人，但随着更多细节被暴露后，人们就会开始改变他们的观点。所以我总是质疑公众的价值观，他们那么快就改变了自己的观点，似乎无法做出自己的判断，而是媒体影响着他们的决定。所以青少年要知道什么是对和错，不然他们很容易就会随波逐流。