giúp e với than one billion users worldwide. The number of Facebook users is growing fastest in Asia. There are,3.6% more users in Asia every month compared to 1.6% in the rest of the world.,The average Facebook users has 120 friends on the site. But how can they all be real friendships? Often,,these people have never actually met. Have teenagers become too interested in their online social life?,Are they just sitting in their bedroom staring at their laptops? Have they stopped going out?,Recently, some scientists have claimed that social networking sites can cause serious health problems.,Dr. Arie Sigman insists that these sites are harmful to young people. Sitting in front of a computer screen,can increase the risk of headaches, diabetes and even heart disease. Furthermore, he believes teenagers,social skills are also becoming worse as a result of overuse of these sites. He says many of today's,teenagers have not learned how to get along with real people in the real world.,However, not all scientists agree with this negative viewpoint. Other studies have shown that a good,online social life often encourages a healthy social life in the real world, too. These scientists say that,chatting in chat rooms is real communication. So who is right? Social networking sites have only existed,for a few years, so it's probably too early to say. What do you think?,1. How long have social networking sites existed?,Social working sites have existed since 2003,2. How many users does Facebook have worldwide?,Facebook has more than one billion vers world.,3. According to Dr. Sigman, social networking sites can increase the risks of which three health problem,4. According to other studies, what are the benefits of social networking sites?,5. Why is it difficult to know which group of scientists is correct?

Question

Accepted Answer

1. Social networking sites have existed for a few years.

2. Facebook has more than one billion users worldwide.

3. Dr. Sigman claims social networking sites can increase the risks of headaches, diabetes, and heart disease.

4. According to other studies, social networking sites can encourage a healthy social life in the real world.

5. It is difficult to know which group of scientists is correct because social networking sites have only existed for a few years, so it's probably too early to say.