It is a dichotomy. People want to share cause they need followers and likes like a Pavlovian dog. So they vomit every moment to everyone they can in search of another hit of dopamine. Except when someone shares something secret or embarrassing, then they want privacy, but still only for these few things.

I think the problem is that we haven't matured as a culture yet to handle this amount of accessibility and sharing. The pendulum is currently in the full share quadrant but will swing back as the consequences of over sharing mount. I expect social media to look vastly different in 10 years time but lessons are only ever truly learned the hard way.