By Nick Bryant
The diplomatic world is considered to be one of protocol and discretion, yet an increasing number of foreign policy officials and diplomats are conducting their business in the most public way possible, on Twitter.
On the morning that Ratko Mladic appeared before the UN war crimes tribunal, the British Foreign Secretary William Hague took to Twitter to issue the kind of diplomatic broadside of which his predecessor, Viscount Palmerston, would have been proud.
