Addiction researchers at the University of Bergen have published The Bergen Facebook Addiction Scale in the journal Psychological Reports.

The test is based on the following six criteria, which are scored on a scale of very rarely, rarely, sometimes, often and very often.

- You spend a lot of time thinking about Facebook or plan use of Facebook.

- You feel an urge to use Facebook more and more.

- You use Facebook in order to forget about personal problems.

- You have tried to cut down on the use of Facebook without success.

- You become restless or troubled if you are prohibited from using Facebook.

- You use Facebook so much that it has had a negative impact on your job/studies.

According to the researchers, if you choose "often" or "always" four or more times, you may be suffering from an addiction.

Facebook addiction produces similar symptoms to drug or alcohol addiction, according to the study, and is most common among users who are young, anxious and socially insecure.

Psychology professor Cecilie Schou Andreassen developed
the scale based on a study of 423 students.