The absence of a framework or policy to address bullying in South Africa compels the country to rely on pieces of legislation that are closely related to anti-bullying laws such as the Child Justice Act 75 of 2008 and Protection from Harassment Act 71 of 2011. Over-reliance on pieces of legislation creates challenges for victims of these bullying crimes because most of the relational aggression exerted towards victims goes unpunished. Some of the adolescents take the law into their own hands, thus, exacerbate and increases the complexity of bullying crimes. Due to advancements in Information and Communications Technology, bully-victim behaviour does not only take place in physical environments such as schools, but it takes place anywhere, anytime (24/7) on Mobile Social Networks. In 2011, a cyberbullying study by the Centre of Justice and Crime Prevention reported that 69.7% of the youth in South Africa falls in the category of bully-victims. This is alarming given that few studies focus on the role of bullyvictims in South Africa. The exact cause for mobile bully-victim behaviour is unclear, and previous studies have highlighted it is between aggressive behaviour and social integration. Therefore, this study examined aggressive behaviour and social integration to determine which of these two factors contribute the most to mobile bully-victim behaviour. Additionally, mobile social network features that enable this behaviour were investigated. The factors that lead to aggressive behaviour and social integration, resulting in mobile bully-victims, were identified through a literature review. Paper-based surveys were issued to Johannesburg high school adolescents. Johannesburg was mainly selected based on finding by previous studies, which highlighted that most of the online bullying and victimisation happens amongst adolescents in Johannesburg. After data was collected, the results were analysed using Statistica version 13.5. The analysis revealed that, indeed, both aggressive behaviour and social integration cause mobile bully-victim behaviour, however, social integration contributed more than aggressive behaviour. The findings also revealed that WhatsApp and Instagram were the most utilized social networks by mobile bullyvictims. There were no differences between males and females when it comes to mobile bullyvictim behaviour. The causes of mobile bully-victim behaviour that have been identified in this study can be used as a starting point to develop legislation/framework aimed at combating mobile bully-victim behaviour. Given that mobile bully-victims are more suicidal and suffer from depression, psychologists and therapists can use the knowledge obtained from this study to develop psychological treatments specifically for mobile bully-victims.