How does Twitter make money? Most of its 230 million users don't know that the answer is advertising. Poppy Harlow sits down with Matt McCall and Rachel Sklar to find out why the brand getting lots of love is short on the ad dollars.
Moments after news of a possible debt ceiling deal in the Senate, Poppy Harlow was live with Warren Buffett for his reaction.
Detroit just became the largest American city to declare bankruptcy. Poppy Harlow explains to Christine Romans the next step for our auto industry's birthplace.