VIDEO : Justin Bieber, One Direction & Ariana Grande Top Most-Tweeted About List of 2014

Justin Bieber was the most tweeted-about artist of 2014 on the social media site. Following his DUI, arrest and year of misbehaving, it's really no surprise. Also on the list are One Direction, Ariana Grande, Beyoncé and Taylor Swift. Meanwhile, Katy Perry was the one to gain the most Twitter followers, with ten million new ones in 2014.