Surprise! There may be a significant correlation between heavy users of Facebook and higher levels of narcissism:

[Participants] all took psychology tests to measure their levels of narcissism, which the study defined as ‘a pervasive pattern of grandiosity, need for admiration, and an exaggerated sense of self-importance’ Those who scored higher on the narcissism test checked their Facebook pages more often each day than those who did not.

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