"Participating in a Study Group is a rewarding experience, but it is different from other types of discussions. Not only do you have the direct postings indicating that people have read your messages, there are also many participants who read your message and do not make comments. (They are called 'lurkers'). What you say can and will be read by many people. As such, you should think carefully before posting a comment, as a Study Group has a huge potential audience of people to influence or infuriate."