A case of Facebook triggering asthma has prompted warnings of the psychological dangers of social networking sites.
Doctors in Italy reported on a depressed 18-year-old who was dumped by his girlfriend and then saw her picture on Facebook.
The shock brought on an asthma attack, which was repeated each time he accessed his ex's profile.
When a psychiatrist persuaded the teenager to stay clear of the site, the attacks stopped.
His mother helped doctors uncover the Facebook connection.