Open Gov / Open Data initiatives are more relevant in a national context than at an international level.
'Open Data' is one of those catchall terms that encompasses a technical development, a philosophy, a trend and an advocacy goal, amongst others.
Today, the word ‘byzantine’ is used to describe devious actions: intrigue, plotting, and bribing.  Historical records show that Byzantine politics were morally neither worse nor better than politics in previous or later years.
In short, full transparency and openness is not an optimal environment for successful diplomacy aimed at solving complex problems through convergence and compromise.
Let me develop the argument:
Twitter has become one of the preferred tools of communication for foreign policy practitioners, from cabinet ministers to ambassadors and diplomats.
I have an intense dislike of anything that might interrupt conversation at the dinner table - and this dislike is currently focused on mobile phones, no matter how smart they are. I don't like competing for anyone's attention, especially when my competition is so intrusive.