<human>: What is the most important thing I should know about my teen's use of social networking sites?
<bot>: The most important thing you should know about your teen's use of social networking sites is that it can be a great way for them to stay in touch with friends and family, but it can also expose them to cyberbullying, online predators, and other risks. It's important to monitor their activity and talk to them regularly about how they are using these sites.