Growth Is Key Concern as GoPro, Yelp, Expedia Stocks Plummet

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Concern that user growth may slow sent the shares of technology companies GoPro Inc., Yelp Inc. and Pandora Media Inc. down at least 14 percent Friday.

The companies, which all went public within the past four years, posted quarterly results Thursday after the close in New York that highlight the challenges they face in keeping the pace of adding users.