wiki option means that the publisher of a feature
(editorial collective) or a newswire post (individual)
is able to "give the option" to others to edit the
post, as in wiki, instead of simply commenting it.
This means having and "edit" option available on the
feature/post - made available by the original poster -
so other users can contribute contents directely from
the web, instead of participating to traditional
editorial mailing lists.