Limit the time teenagers spend on social media sites

I agrree with this topic; we should limit the amount of time teenagers spend on social media sites. There are three reason I think so. First, it's not good for our eyes. using PC make our eyes tired. Second, therea are many wrong information. On the internet, we can get new information. However, there also have wrong information. Third, there are a lot of troubles on the internet. Teenagers should not tell our inforamation to peoplw who met on the internet. It may cause trouble. Because of these reasons, I agree this topic.