Privacy is a luxury society often take light of, which in turn makes it easier to pin point which groups are the ones with hidden agendas, albeit I trust that there is a vast spectrum of plausible reason for such actions, but like psychology and numerous scientific studies, it would be an educated conclusion based on hypotheticals concerning the constant and controlled variable. I really think that would be an excellent thesis for a psychology major. No? Probably I'm just this insane sociopath who takes entertainment in being an obnoxious kid that I am with daily occurrences. Let me just put it out there. I am not knowledgeable, but solely an intrigued millennial who prefers the comfort of her own room than actually socialize with fellow humans and converse in the typical manner- though many would declare otherwise. 

I personally keep my accounts in check, if not daily, frequent. Often I look at past entries and contemplate the relevance of their existence to my current lifestyle- I sense an anal self-absorbed perfectionist. I digress, but that in itself expresses the point of the numerous possibilities of a "study" like this. I trust that you recognize the sarcasm in this. Nevertheless, I imagine people should exert time into polishing their pages as if they were picking out clothes to wear, now that I've imparted that there are individuals such as myself, who take educated conclusions from your "FB". I might as well be your next boss.