I agree with Nick that online discussions having a certain quality. WELL as an example, many people take part in that "virtual community" and have some benefits. Parents can share experiences in taking care of children, especially when they have problems in health. With a short time, parents can gain knowledge that they haven't got before by other parents in the world. I want to explain more clearly, in case you have many friends who know the information you need. If you write letters and send to them even by Federal Express, it will take longer time to have information back. If you are research in particular field, online discussions provide you not only a huge of information but also up-date information. In my view point, the most advantages of online discussions is saving time, money and collecting many sources of information.