Justin Bieber kisses Actress Ariana Grande

As of May 2013, Bieber's Twitter account (@justinbieber) is the most popular celebrity account, with 41 million followers. His account acquires one new follower every other second.

His popularity on Twitter at one point accounted for three percent of all Twitter related traffic, with a Twitter employee commenting that "racks of servers are dedicated" to Bieber. This resulted in over 180 million page views for the service each month. Bieber was frequently a trending topic on Twitter when the feature first launched because his fans frequently discussed him on the network, and he was named the top trending star on Twitter in 2010; Klout gave his account a score of 100. In April 2013, the social media analysis company Socialbakers concluded that 16.7 million of Bieber's 37 million Twitter followers are not genuine.

Justin Bieber kisses actress Ariana Grande in Twitter photo, sparks fan outrage.

The size of Bieber and Lady Gaga's follower bases are cited as a reason why marketers should pay attention to Twitter, due to their ability to reach millions of people with a single tweet. 8.3% of tweets mentioning "bieber" were semi-automated and probably Twitter related spam. Research done about Twitter and the 2011 Egyptian revolution includes Bieber as he made tweets about the topic at a time when he had roughly 8 million followers. His multiple tweets resulted in 32,000 responses each, which made Bieber's Twitter account one of the single largest nodes for discussion about the uprising on Twitter.