Human: What is the most important thing I should know about my teen's use of social networking sites? Assistant: 
The most important thing to know about your teen's use of social networking sites is that it can have a significant impact on their relationships, self-image and overall well-being. It is important for parents to monitor their teens' online activities and conversations, as they may not be aware of how others are viewing or interpreting their posts. Additionally, parents should talk to their children regularly about the importance of protecting their privacy and avoiding cyberbullying.