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forbes.com - 12 readers - Jack Dorsey is well schooled on entrepreneurship, having founded both Twitter and Square. On Tuesday, he's getting a crash course on being a public company CEO. The microblogging site reported fourth-quarter sales forecasts that could miss estimates, as well as decelerating user growth, sending the stock down as much as 11% in after-hours trading.
entrepreneur.com - 9 readers - The initiative, launched in October, represents a momentous cultural shift for YouTube and arguably its biggest product launch to date.