Tweet this: Study finds limits to new 'Twiplomacy'

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GENEVA (AP) — A new study finds almost two-thirds of world leaders now have a Twitter account, but many don't bother to follow each other.

The "Twiplomacy" study Thursday by PR firm Burson-Marsteller says President Barack Obama is the most-followed world leader, including by 76 of his peers and other governments.

It says his May 9 tweet that "same-sex couples should be able to get married" is the most re-tweeted to date.

Burson-Marsteller's Matthias Luefkens says 16 of the Group of 20 world leaders actively use Twitter for public diplomacy, but their counterparts in China, Saudi Arabia, Indonesia and Italy have yet to join.