MDN content can be used on other sites, including WebPlatform.org, under MDN's CC-BY-SA license. However, this is not the default license on WebPlatform.org, which means that MDN content that is used there must be specially marked.
MDN users may wish to indicate that they agree to let the content they have contributed to MDN be used on WebPlatform.org under that site's contributor agreement. Or they may want to make explicit that they do not agree to that.
This would enable Webplatform.org editors to figure out whether particular content requires marking as CC-BY-SA. (I.e., if all contributors to a page have indicated consent, then it can be used under WebPlatform.org's term.)
I envision adding fields to the user profile page like this:
() I agree that content I contribute to MDN can be reused on WebPlatform.org under the terms of that site's Contributor Agreement. My WebPlatform.org user profile is: [ ]
() The content I contribute to MDN can be reused only under the default MDN license (CC-BY-SA).
If the user selects the first option, then they are required to supply a link to their WebPlatform.org user profile. This indicates that they have consented to the WebPlatform.org Contributor Agreement by creating an account.
The fields should be in the unset state (no default) until the user explicitly modifies them.
*** Bug 799573 has been marked as a duplicate of this bug. ***