It all depends on what the public interest angle is. In the case of Facebook the hypocrisy on display borders on the unbelievable. Facebook arguably infringes in the worst way possible on the privacy of a very large chunk of humanity but is highly offended when its own 'private' communications are exposed.

If it's good for the goose it is good for the gander and companies with this much influence on the world should welcome transparency, not oppose it. And if they do not welcome transparency then we'll have to help them along a bit every now and then.