More than 4million South Koreans have downloaded an application that permits them to have a conversation with an imaginary friend on their mobile device. The vast majority - as much as 80%, according to the Chosun Ilbo newspaper - are teenagers, triggering concerns about the pressures of life on young people.The app is designed to send a supportive or reassuring text message to a user who expresses feelings of loneliness or depression.Psychologists suggest that the popularity of the app is a reflection of the problems young people have in establishing friendships and maintaining them through the ups and downs of life.A survey by Seoul National University earlier this year indicated that more than 58% of secondary school students have "unstable" relationships with other pupils in their class, and as many as 20% said they were afraid of being bullied."People who feel lonely are desperate to find someone who sympathises with them and will react to what they say," Hwang Sang-min, a professor at Seoul's Yonsan University, said."It does not matter who talks to them. They just want to hear something from anyone."A recent study by South Korea's Ministry of Gender Equality and Family showed that nearly 33% of teenagers felt stressed about their studies, and a further 26% expressed fears about their chance of finding a good job.More than 11% said they had considered suicide, 17% of them blaming loneliness. ..