Researchers from the University of Michigan recruited 82 young adults to find out whether using Facebook influences people's feelings and satisfaction with life.
For two weeks, participants answered a number of questions about their emotions and worries five times a day to rate their well-being.
Researchers concluded that people who used Facebook were less happy than those who spoke to their friends on the phone or face to face.
The lead researcher on the project said the findings show how people's mood fluctuates depending on their Facebook usage because of jealousy and resentment when they see photos of fabulous vacations, expensive purchases and adorable children.
This is not the first time a study has proven this phenomenon. Researchers in Sweden studied over 1,000 people and found users who spend more time on Facebook have lower self-esteem.