Yahoo! Answers in Japan

I was very busy for my work in Japan, I couldn't spend a lot of time for myself for long time. However, after moving to the U.S. 4 years ago, I suddenly had a lot of excess time. I didn't know what I should do in the U.S. every day. One day, I found that many people were worried about their health problems, and were asking for the solution online which was like "Yahoo! Answers" in Japan. I read many questions, and I found that most answers were wrong. Because most people were not specialists, they sometimes misled questioners. It couldn't be helped. At the time, I had a lot of time, so I answered many questions from medical specialist standpoint. After moving to the U.S., I answered 500 questions in first 10 months. Many people were glad to get details, and I enjoyed helping others. However, there were still many similar questions. I thought this process was endless. Then, I became busy and quit answering online.
Today, I read my old answers and was impressed at myself. I thought all my answers were very specific and helpful information. Sometimes, I feel that I am worthless in the U.S. However, I think that I will help others in real world someday. I don't know if I can do this yet, but I hope so.