Disclosing personal information significantly increases the likelihood of cyberbullying incidents, highlighting the significance of investigating the relationships between various stakeholders in cyberbullying incidents. Our objective is to gain insights into the role of different stakeholders, types, and typical paths of personal information in cyberbullying incidents. To achieve this, we conducted a large-scale survey with a representative sample of internet users from the United States and Nigeria (N = 1555). Our findings indicate that cyberbullying is often fueled by personal information which becomes known to other stakeholders directly or through social media. Additionally, cyberbullying incidents involve more than just attackers and victims; they can involve other stakeholders as third-party ‘disclosers’. Both strangers and friends typically engage in such activity. Finally, cyberbullying incidents are twice as common in Nigeria as in the United States. Our findings have implications for design, social media literacy programs, and policy.