... researchers looked in particular at connections between social-network use and the personality trait that psychologists refer to as "need for cognition," or NFC. NFC, as Professor Zhong explained in an email to me, "is a recognized indicator for deep or shallow thinking."
People who like to challenge their minds have high NFC, while those who avoid deep thinking have low NFC. Whereas, according to the authors, "high NFC individuals possess an intrinsic motivation to think, having a natural motivation to seek knowledge," those with low NFC don't like to grapple with complexity and tend to content themselves with superficial assessments...
The study revealed a significant negative correlation between social network site (SNS) activity and NFC scores. "The key finding," the authors write, "is that NFC played an important role in SNS use. Specifically, high NFC individuals tended to use SNS less often than low NFC people, suggesting that effortful thinking may be associated with less social networking among young people." Moreover, "high NFC participants were significantly less likely to add new friends to their SNS accounts than low or medium NFC individuals."