Dr Nitzan said: ‘The patients shared some crucial characteristics, including loneliness or vulnerability due to the loss of or separation from a loved one, relative inexperience with technology, and no prior history of psychosis or substance abuse.
‘In each case, a connection was found between the gradual development and exacerbation of psychotic symptoms, including delusions, anxiety, confusion, and intensified use of computer communications.
A study from the University of Gothenberg found that people with low income and low-educated people spend the most time on Facebook.
And within this group, those who spent the most time on the site were less happy and less content with their lives.
Up to 85 percent of Facebook users surveyed said they logged into the social networking site on a daily basis.
And 26 percent of them felt ‘uneasy’ if they didn’t log in regularly.