Social media simply amplifies what is already common among human beings. One way it seems to do this is by flattening and legitimizing impropriety. Normal societies are "chunky", that is, you have niches and enclaves and varying distance unified in some increasingly "thin" manner. This enables various kinds of relationships to flourish (think of how marriage creates a special space for the couple, and then another space for the family that results from it, then consider the different space that the extended family creates, or coworkers create). But in social media, this structure evaporates. Everyone is shoved into the same space. People you barely know or don't know are on par with your closest family and friends. This is bound to cause aggression and nosiness and impropriety. To put it hyperbolically, it's like having your coworkers in bed with you making lewd comments as you have sex with your spouse. Social media encourages and defaults to this kind of boundary violation so that you are effectively consenting to it by using it because otherwise, it makes little sense to use. So telling someone to mind their own business becomes more difficult _because you're the one who volunteered the information in the first place_, whereas you can still tell an intrusive stranger to piss off with the confidence of moral justification.