What's the Best (and Worst) Ad Campaign on Twitter?

Nov. 11 (Bloomberg) -- Bloomberg deals reporter Cristina Alesci looks at the most effective Twitter ad campaigns and some that backfired as well. She speaks on Bloomberg Television’s “In The Loop.”

8,000-Mile Journey Spurs Vale Shift as Iron Outlook Fades
37:24 - For years, Brazil's Vale SA fought with rival iron-ore producers in Australia to supply the fast-expanding steel industry in China by building more mines and boosting output. But slowing demand and prospects of a multi-year glut are changing the battle lines. Now, it’s all about protecting ever-narrowing profit margins. Bloomberg's R.T. Watson reports. (Source: Bloomberg)
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