Bystanders in cyberbullying refers to “the individuals who witness bullying events online”. The behaviors of bystanders after witnessing bullying can be divided into two types – prosocial behaviors and antisocial behaviors. There are factors that influence bystander’s behaviors which include their personality traits (impulsiveness, extroversion and openness), psychological factors (empathy, self-efficacy, social support and loneliness), the degree of self-disclosure of bullied individuals, and their relationship in the ecological environmen...