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Greg Tseng, CEO of the social networking website Tagged, had just landed in Manila, on Saturday, June 6, 2009, to kick off a long-awaited vacation. As soon as he dragged his jet-lagged body up to his hotel room, though, an onslaught of phone calls, e-mails, and text messages from his co-founder, Johann Schleier-Smith, and other Tagged employees began: Something was seriously wrong with the site. In the 24 hours since Tseng had left his office in San Francisco, thousands of complaints had been filed by users—who claimed that Tagged's new registration process had somehow tricked them into spamming all of the contacts in their e-mail address books

This year DonorsChoose.Org made our list of The Most Innovative Companies . We speak to CEO Charles Best on how he applies a "best of breed e-commerce" approach to transforming public education.