Image: Mashable composite/ Ikon Images/Corbis

Arianna Huffington built The Huffington Post into a global digital media empire, while Jonah Peretti, who helped found HuffPo, went on to co-found BuzzFeed, turned into a digital juggernaut that could soon be valued at $1.5 billion. The former colleagues now stand at the vanguard of the… [Read more on Mashable]