BTS is among K-pop's most powerful acts, while the Vamps have filled the U.K.'s void for a young pop-rock band. Both groups have faced off before for the title of "Best Boy Band of 2017," and while it was a super close call, BTS won with 187 more votes. The BTS ARMY is the reason why the international superstars won Top Social Artist at the Billboard Awards. The Vamps have been on the rise for a few years, and owe their growing popularity to their Vampettes. Which fan army is the most mobilized? 📣
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