When a couple breaks up, Facebook can be particularly damaging. The reason for this is because Facebook can be used as a tool to spy on an ex-partner, which can lead to obsessive behaviour and further damage the relationship. In addition, seeing an ex-partner's profile can trigger feelings of jealousy and insecurity, which can also damage the relationship. Finally, if a break-up is not handled well, it can lead to cyberbullying or harassment from either party.