For more than a decade, the Mexican government has played an active role advocating for millions of migrants abroad.

CNN: Mexico 'welcomes' new U.S. immigration reform push

Toward the end of the interview, Costolo found time to discuss the 2012 presidential campaign, in which Twitter has played an active role.

CNN: Mark Milian,

The state has played an increasingly active role.

ECONOMIST: Banks in emerging markets

She has testified twice as a Congressional expert witness on Crowdfunding and played an active role in the shaping and passage of the Crowdfunding Bill of the JOBS Act.

FORBES: Investors, would you invest?