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The more research we conduct, the more links we find between and social media behavior. Narcissists use sites like Facebook, Twitter, and Instagram in ways quite different from others.

One recent result highlights this, showing that narcissists use fewer Facebook privacy settings [1]. A study of more than 250 people showed that narcissists not only used fewer settings but were also less vigilant in monitoring their profiles' privacy.

Theories of narcissism explain this. Narcissists often feel like they are superior, more interesting people. Thus, they feel like what they have to say online would necessarily be of interest to others. They also crave the approval of others—and social media makes this quick and easy with likes, favorites, and retweets. The medium feeds narcissism. Thus, we shouldn't be surprised that they use it in a way that sends their messages out to the widest audience possible.

Interestingly, when questioned in the study, narcissists actually voiced more concern about privacy and security than others. However, they did not combine that concern with modifications to their behavior.

It could be that they are especially offended by criticism, and their main privacy concerns are about unfriendly people commenting on their posts. But that is just speculation at this point; the research has not yet investigated this point deeply.

[1] Smith, Karen, Francis Mendez, and Garry L. White. "Narcissism as a Predictor of Facebook Users' Privacy Concern, Vigilance, and Exposure to Risk." International Journal of Technology and Human Interaction (IJTHI) 10.2 (2014): 78-95.