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Snapchat users can upload photos and videos onto the new Snap Map. When a topic is trending, it'll pop up on a heat map. The image above is a composite of Snapchat screen grabs. Shelby Knowles/NPR hide caption

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Shelby Knowles/NPR

Snap surged Thursday in its first day of trading, with shares jumping more than 40 percent from Wednesday's IPO pricing. Among the day's big winners was a small Silicon Valley high school. Bryan R. Smith/AFP/Getty Images hide caption

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Bryan R. Smith/AFP/Getty Images

The logo and a page of mobile app "Snapchat" are displayed on tablets. Hackers broke into Snapchat, the popular mobile app, accessing the phone numbers and usernames of 4.6 million users and publishing them online. Lionel Bonaventure/AFP/Getty Images hide caption

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Lionel Bonaventure/AFP/Getty Images

Twitter made its debut on the New York Stock Exchange in November. Both the social media giant and the relative newcomer Snapchat are valued in the billions, but neither company has yet turned a profit. Emmanuel Dunand/AFP/Getty Images hide caption

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Emmanuel Dunand/AFP/Getty Images

$0 Profits Couldn't Hold Back This Year's Tech Darlings

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