请认真阅读下面短文，并根据短文内容回答问题。
Microblogs: a two-sided blade(双刃剑)
Micro-blogging has been growing quickly over the past year. As a result, many other forms of social networking are no longer popular, even if they just came into being several years ago. However, micro-blogging is a two-side blade. It helps, but it also hurts.
Micro-blogging is famous for spreading messages almost immediately. It also helps the public manage some agencies and organizations. For example, in March 2011, some micro-bloggers persuaded the Nanjing government to stop cutting 600 old trees in the downtown area; after a serious earthquake and tsunami(海啸) hit Japan, micro-bloggers called for giving a helping hand to the Japanese victims. In July, micro-bloggers made clear the “Guo Meimei” scandal（丑闻）, and brought the Red Cross Society of China under investigation.
Like everything in life, micro-blogging also has an opposite side.
Guo Meimei, who was involved in the scandal of the Red Cross Society, suffered from all kinds of online attacks, and said she was being followed up on and even threatened. Another problem is the spreading rumors（谣言）, such as the rumor that Shanxi was going to be struck by a big earthquake and “Jin Yong’s death”—Jin Yong is a Chinese novelist famous for his wuxia novels.
In the online world, large amounts of information is easily spread to a large network, but sometimes there is no official source. So it’s highly important for everyone to have the ability to tell truth from rumor. It is also suggested that Internet companies should stop the accounts of users who spread rumors.
【小题1】Why are many forms of social networking no longer popular?
【小题2】What is micro blogging famous for?
【小题3】Who persuaded the Nanjing government to save 600 old trees?
【小题4】What are bad points of micro-blogging?
【小题5】How can people deal with the online world?

Feeling lonely can make you sick. Doctors have long known that loneliness can cause many health problems and even death. What they didn’t know is   16  this feeling causes illness. A study in the online magazine Genome Biology  17  that loneliness actually influences the important part of our bodies—our genes.
In a small population of patients, researchers   18  more than 20,000 genes to compare how the genes of lonely and non-lonely individuals (个体) express themselves in molecular processes (分子过程) and in personal health. They found that gene expression is   19  in chronically (长期地) lonely people. “We now have a new way for understanding the relationship   20   social experience and physical health,” explains the study’s lead author, Steve Cole of University of California, Los Angeles.
“This study—the first to link (联系)   21  with gene changes—is special and exciting,” says Emma Adam, a professor of human development at Northwestern University. “It   22  in the black box.”
According to John Cacioppo, an author of the study from the University of Chicago, the
work suggests that loneliness is a warning   23 , much like physical pain. “This feeling is so bad because   24  of us wants to be forgotten; that’ s also what human means,” he says. “It makes us   25  for other people and want to be with friends when we’re lonely.”

A new study suggests that the more teenagers watch television, the more likely they are to develop depression (抑郁症) as young adults.
The researchers used a national long-term survey of healthy young teenagers of about 13—16 to find out the relationship between media(媒体) use and depression. They based their findings on more than 4000 young teenagers who were not depressed when the survey began in 1995.
As part of the survey, the young people were asked how many hours of television or videos they watched daily. They were also asked how often they played computer games and listened to the radio. Here was the result. The young people spent five and a half hours a day using media and more than 2 hours of that was spent watching TV.
Seven years later, in 2001, more than 7% of the young people had signs of depression. The average age at that time was 21. Brian Primack at the University of Pittsburgh medical school was the lead author of the new study. He says every extra hour of television meant an 8% increase in the chances of developing signs of depression.
The researchers say they did not find any such relationship with the use of other media such as movies, video games or radio. But the study did find that young men were more likely than young women to develop depression given the same amount of media use.
Doctor Primack says the study did not find out if watching TV causes depression directly. But one possibility, he says, is that it may take time away from activities that could help prevent depression, like sports and social activities. It might also prevent a person from sleeping well, he says, and that could have an influence.
The study was just published in the Archives of General Psychiatry.
In December, the journal Social Indicators Research published a study of activities that help lead to happy lives. Researchers from the University of Maryland found that people who describe themselves as happy spend less time watching television than unhappy people. The study found that happy people are more likely to be socially active, to read, attend social services and to vote.