That's an arbitrary line to draw, and really misses the forest for the trees. It makes little difference in the end if it's a corporation blackmailing and ruin

That's an arbitrary line to draw, and really misses the forest for the trees. It makes little difference in the end if it's a corporation blackmailing and ruining a person's life or a government. Facebook can share your data with whoever they want to, so the government can probably get it anyway. We have no idea who Facebook shares data with, who inside Facebook can see it, etc. Every company claims they have great security and follow best practices, until it's found out that they don't, so taking their word for it that your data is safe is naive. In both cases the end user is powerless unless they stop using the service altogether.