South America

Twitter is very popular among South American politicians who often tweet personally. Three-quarters of presidents in South America have personal Twitter accounts, four of whom have well over one million followers including Venezuela’s Hugo Chavez (@chavezcandanga) - the second most followed world leader on Twitter.
The leaders of Argentina, Chile, Colombia, and Venezuela are well connected and occasionally use Twitter for public diplomacy, using @mentions to communicate with each other via Twitter. An exception is Brazil’s President Dilma Roussef (@dilmabr) who, while popular among her peers, does not follow anyone back and has not tweeted since being elected president in late 2010.