BTS Lights up 'The Tonight Show': Twitter Reacts

BTS were always going to be a big deal when they appeared on The Tonight Show, where they stopped by for a chat, showed off some dance moves and dazzled with a performance. 

When the ARMY got to work, Twitter lit right up.  The chart-topping K-pop superstars performed their songs “Idol” and “I’m Fine” and had the NBC studio audience constantly screaming at the top of their lungs.    

Described by Jimmy Fallon as “the biggest boy band on the planet,” BTS stayed true to form by dominating the social chatter for hours after their appearance as the haghtags #BTSonFallon, #BTSGrammy and #JimmyFallon trended on Twitter through the night. Check out some of the best reactions below.