Houston, Jan. 9 -- Negative social media behaviours, such as comparing oneself to others or spending too much time scrolling through Facebook or Instagram, may indicate major depressive disorder, a study has found.

The study, published in the Journal of Applied Biobehavioural Research, showed that certain social media factors were linked with major depressive disorder (MDD) in a study of millennials.

In the study of 504 millennials who actively use Facebook, Twitter, Instagram, and Snapchat, individuals who met the criteria for MDD scored higher on the Social Media Addiction scale were more likely to compare themselves to others better off than they were.

They also indicated that they would be more bothered by being tagged in unflatter...