A developer has already indicated that steemit may be a great tool in these matters you describe, not only to increase a potential reward but also to incentivize the sharing of a government secret even further.

I apologize for not providing a link, it was a comment on another post from a developer and i cannot recall which post exactly, but the use-cases for wikileaks-like matters has been considered.

I will try to find my way back here if i stumble upon the post again.