According to a survey of the social networking usage by heads of government, U.S. President Barack Obama has topped the league of world leaders with 17 million followers on Twitter.

His Twitter account @BarackObama sent the most popular tweet of any world leader on 9 May.
The account is ranked fifth in the Twitterverse for followers, just behind @britneyspears, according to the study.
Venezuelan president Hugo Chavez - @chavezcandanga, is the second most popular leader on Twitter, and 38 per cent of his tweets are replies.
Among world leaders on Twitter, David Cameron came fifth with more than two million followers.
However, while Obama was top in terms of number of followers, only 1 percent of tweets from his account are replies, putting him well down the rankings in terms of engaging with his followers.
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Like many government accounts, his team sent the vast majority of Obama's messages.
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The study also found that politicians frequently discover Twitter during election campaigns, but once elected the accounts fall silent.
Source-ANI