If you invite response, you'll get it. Make sure you have the human resources to respond. It is possible to have the responses come straight to you, or to have them published immediately on a page on the Internet that the writer can go to. This can be used like a visitor's book, but it could be used far more imaginatively. Anglia Polytechnic University are conducting some courses in this way.
Students enrol and then take part in discussions by writing answers to questions.
These answers are published on a particular site. Other students on the course can read the answers before they respond to the points in the discussion. And, of course, the tutors chip in. I cannot here, go into how to set up response forms. Details are readily available in the books mentioned above.