Well, google is one third party that I would count as a violation of my trust--obviously, that does not necessarily apply to every possible third party, if that

Well, google is one third party that I would count as a violation of my trust--obviously, that does not necessarily apply to every possible third party, if that is what you are getting at? Nor would it necessarily apply to google, if the specific content was meant to be shared with google, or whatever. My point is: Yes, it is obvious that other people can violate my trust by sharing information with third parties, and I might not even know, as that doesn't even require email or computers. People could be sending copies of snail mail letters I send them to some company offering them 10 cents per piece or something ...