In a high school setting it would be very difficult to use facebook chat because most schools have social networks such as facebook blocked. MASHABLE.com has a similar application like facebook chat. At MASHABLE you can make your own 'group'. In this group you can customize the settings so that only the students and teachers can view the activity. You can also customize it so that the teachers and students can post things in real time and use the facebook chat-like application to discuss matters privately. Parents would be more comfortable with this social network as opposed to facebook, because it can be monitored by the teacher.