Saad Hariri [Getty Images]
The Connection: Prime Minister of Lebanon (2009-2011)
Saad Hariri lost his post as prime minister of Lebanon last year after Hezbollah cabinet members walked out on him for refusing to reject the findings of a tribunal implicating members of the Islamist group in his father's murder. He now leads the opposition against Prime Minister Najib Mikati, a fellow billionaire, but has been living mostly in Saudi Arabia, reportedly for security reasons. He's chairman and chief executive of Saudi Oger, the source of the family's wealth. A recent ski injury temporarily slowed down his relentless tweets against the Syrian dictatorship.