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Welcome to Ad Age's Wake-Up Call, our daily roundup of advertising, marketing, media and digital news. What people are talking about today: Facebook CEO Mark Zuckerberg was polite and calm during his first of two days of testimony on Capitol Hill, answering questions that were sometimes not as pointed or well-researched as they could have been. ("How do you sustain a business model in which users don't pay for your service?" Sen. Orrin Hatch asked. Zuckerberg blinked a few times, then responded: "Senator, we run ads.") Wall Street apparently liked Zuckerberg's performance, and Facebook's stock closed up 4.5 percent.

Ad Age's Garett Sloane breaks down six notable moments from the testimony to a joint Senate committee, including this exchange about a rumor that won't die, though Facebook has insisted it isn't snooping on user conversations to serve them more relevant ads.

"Yes or no, does Facebook use audio obtained from mobile devices?" asked Sen. Gary Peters of Michigan. Zuckerberg called it a "conspiracy theory," and simply said, "No."

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