Klout

With 500 million users and counting, Twitter has become a favored platform for politicians -- or, at the very least, their PR departments -- to share their views with the world.

In fact, according to a recent study on so-called "Twiplomacy" by the communications firm Burson-Marsteller, more than three-quarters of world leaders have "joined the conversation." As of July, the 505 world leaders with Twitter accounts boasted nearly 106 million followers combined. Politicians ranging from Iran's new President Hassan Rouhani to Pakistan's former leader Pervez Musharraf have taken to the medium to exercise leadership -- in 140 characters or less. Foreign Policy has turned to four of the most interesting Twitter analytics tools available to see what insights we can glean from the Twitter accounts of eight of the most powerful leaders on the globe, from America's Barack Obama to India's Manmohan Singh.