Got one of those friends who CONSTANTLY floods Facebook with photos?  Like . . . you haven't talked to her since high school, but you've seen 8,000 pictures of every vacation she's taken in the past five years?

Yeah . . . she's got self-esteem issues.

According to a new study from the University of Buffalo, women who base their self-worth and self-esteem on their appearance share more photos online . . . and have more Facebook friends . . . than women who are more secure.

They didn't find the same connection with men.

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