Chou and Nicholas Edge interviewed 425 students, asking them whether they agreed or disagreed with such statements as “Many of my friends have a better life than me,” and “Life is fair.”

They also asked about the students’ Facebook usage, including how many “friends” they had on the site, and how many of those friends were really people they knew.

After controlling for race, gender, religious beliefs and whether the volunteers were unattached or in a relationship, the researchers saw a pattern: The more time students spent on Facebook, the more they thought others had it better than they did.