The AP, now competing with Reuters for fawning over the Saudi King, finds this to be an imporant study

"The world leader whose original tweets generate the most retweets is Saudi Arabia’s King Salman, according the latest “Twiplomacy” study by communications firm Burson-Martsteller. “He (King Salman) posts exclusively in Arabic and without any visuals, but every tweet is a digital home run,” said the report, which was based on analysis of 856 official and personal Twitter accounts of leaders in 178 countries." (thanks Basim)