The problem is that
share as a verb is a bad metaphor for resources that can be replicated without limit;
publish (or
send,
broadcast) is the right metaphor for that process when seen as an instant, one-off action.
Now shareD as a state is how the metaphor makes sense, for content stored at a common resource where one can take it back later, like your profile on a social network. So a better use that would hold the right nuances would be:
- Publish for making copies of the content and sending them to channels where one doesn't have control.
- Shared / Private for the status of content on channels on which you keep control to change that status.
Unfortunately, the needs of social sites (that try to make as much shared information as possible, and avoid people to withdraw it) have promoted the current confusing usage and spoiled it for all.