Also consistent with
Hypothesis 7, narcissism was positively associated with updating
about diet/exercise, but the use of Facebook for self-expression
rather than validation was positively associated with updating
about diet/exercise over and above the control variables and traits
(b = .24, p < .01). Self-expression mediated the association of narcissism
with updating about diet/exercise (b = .03, p = .03 (CI:
.003–.04)), suggesting that narcissists may broadcast their diet
and exercise routine to express the personal importance they place
on physical appearance