I think this is what covers the site in the creation an article from a thread/tutorial:
http://www.bushcraftuk.com/internal/legal-documents/bushcraftuk-terms-and-conditions-of-use.html
3. CONTENT SUBMITTED TO THE WEBSITE
...............................Any Content provided by you by, for example, posting messages to bulletin boards or chat forums, uploading files, inputting data, or engaging in any other form of communication through this Website,
although owned by you, is subject to a royalty-free, perpetual, non-exclusive, unrestricted, world-wide licence allowing Bushcraft Media Limited to use, distribute, copy, sub-license, adapt, transmit, publicly perform or display any such content. You agree to irrevocably and unconditionally waive on your behalf in perpetuity in respect of such Content the benefit of any provision of law known as moral rights of authors or any similar law in any country.
I do, however, think that the writer should be given prior notice, the choice and time to submit ammedments and the opportunity to recieve proper accreditation (whether their proper name or user ID etc):
although owned by you . On occasion I borrow ideas to teach scouts and I always accredit the person(s)/source from whom I gained the information as accurately as I am able