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Viral rap star Kreayshawn debuts on Billboard's Social 50 at No. 35 thanks to her continuing building buzz and the growth in popularity of her "Gucci Gucci" video on YouTube.

After falling off Billboard's Social 50 chart last week, Christina Grimmie re-emerges at No. 17, thanks to the success of two YouTube videos. On July 15, she covered Demi Lovato's latest single "Skyscraper," pulling in 3 million views. This is a feat, considering that the official video by Lovato, which debuted on July 14, sits at 5.3 million views.

As Pandora rolls out its new design, with an increased emphasis on music sharing, the big question is: How does it compare to Spotify? While the two music services are separate products, with generally separate audiences and features, it’s a question worth asking.