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View of the Facebook homepage taken in Washington on May 6, 2012. Facebook, already assured of becoming one of the most valuable US firms when it goes public later this month, now must convince investors in the next two weeks that it is worth all the hype. Top executives at the world’s leading social network have kicked off their all-important road show on Wall Street — an intense marketing drive ahead of the company’s expected trading launch on the tech-heavy Nasdaq on May 18. AFP PHOTO/Nicholas KAMM