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Pandora, the leading Internet radio service, reports financial results July 24.
Pandora, the leading Internet radio service, reports financial results July 24.Bloomberg News/File 2012/Bloomberg

It was a tough day for Internet companies. Pandora Media, the music streaming service, fell 7.3 percent, while Twitter fell 7 percent. Facebook and Netflix each fell more than 3 percent. Pandora fell on Monday, too, by nearly 6 percent. The stock had jumped nearly 35 percent between early May and this week. But Pandora "faces concerns over whether its previously impressive growth is stalling," The Motley Fool's website noted. Pandora trades at more than 150 times earnings.