Are people not writing in physical diaries to prevent future breeches of privacy? (Odd to think of Facebook etc. like that.) Or are people doing it out of conve

Are people not writing in physical diaries to prevent future breeches of privacy? (Odd to think of Facebook etc. like that.) Or are people doing it out of convenience / least resistance? If so, are they cognizant of what this means for the longevity of the data? I'm not sure the future impact is an intentional choice...