What is the main idea of the news item? [originaltext] Students at the Hogook

Students at the Hogook Middle School in Ilsan, just outside of Seoul, have a unique assignment.
    Their task is to go online to message boards and other forums and write positive, cheerful comments. Teachers and other adults hope those comments will discourage others from leaving vicious and negative remarks.
    15 year old Kim Hee-joo, explains what she usually posts. She says on her school’s homepage she writes thank you messages to friends, family and teachers. And also she sees people making bad comments about celebrities, she leaves nice messages, because when people see positive comments they are more likely to stop saying bad things and change their attitude.
    The Hogook school is participating in a nationwide program called the Sunfull Movement. It is a play on words in Korean meaning good reply. The aim is to stop cyber-bullying and create a more positive atmosphere on the Internet.
    Online attacks are an increasing problem in South Korea, one of the world’s most connected nations. The National Police Agency receives tens of thousands of complaints every year, but there is not much that can be done to stop it, since attackers are often anonymous. In the worst cases, authorities say cyber-bullies have pressured some celebrities and ordinary people to take their own lives.
    South Korea is not alone in combating cyber-bullying. An Australian high school recently suspended students for posting hateful comments about a teacher on Facebook. And lawmakers in one US state are trying to make attacks using social media illegal following the suicide of a young girl who received abusive messages online.