Jack & Jack look likely to be the next major Vine music stars. They're two young white guys doing comedy Vines, now with millions of followers, who recognized they could leverage that fame and start making music. Their validator beyond Vine and other social media followers, including 474k+ on YouTube, is their rise on the Billboard Hot R&B/Hip-Hop Songs chart to #25 on the strength of iTunes sales of the single "Wild Life." How much Jack & Jack's live appearances made the difference with this latest push is hard to say but it does show they're serious about making the...

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