Pope Francis has by far the most clout of any world leader on Twitter because he is so widely retweeted, a study of political use of the social network showed on Wednesday. With 14 million followers for the nine different language versions of his @Pontifex account, the cyber-savvy pontiff boasts just a third of those notched up by US President Barack Obama. The real benchmark is tweets retweeted by followers to their own network. Pope Francis wins hands down, with his Spanish-language tweets retweeted more than 10,000 times on average, and his English-language tweets, over 6,400 times.