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I think it makes sense to pick a default license like CC-BY-SA for all the questions and answers in the forum. So when a user is asking a question or posting comments, the footer below the text box should indicate that posting implies agreement to share the content under this license. Without this, the forum content cannot be aggregated or used in other places to building a knowledge commons if necessary. For example, following wikipedia style:

"By posting here, you agree to the Terms of Use, and you irrevocably agree to release your contribution under the CC-BY-SA 3.0 License. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license."

Hyperlinks for terms of use and CC-BY-SA of course. In addition to that, the footer of this website says

"Copyright ASKBOT, 2010. Some rights reserved under creative commons license."

This is vague as it doesn't link to the specific creative commons license and there are many variants. Please be more explicit.