Fans are left wondering why Justin Bieber has unfollowed his longtime mentor and close friend Usher on Instagram, with some speculating it could be due to a "big" reason.

Justin Bieber has unfollowed his longtime mentor Usher on Instagram, causing a wave of speculation among fans. The move follows a series of recent changes in Bieber's social media activity, leading many to wonder about the reasons behind the sudden shift.

The first theory about the Usher shade is dark. Some fans are drawing lines between Bieber’s unfollow spree and the ongoing Sean “Diddy” Combs saga. If you’ve missed it, Diddy is currently facing some pretty serious allegations including accusations of sex trafficking and racketeering.