BuddyPress.org

the problem i see with mediawiki is that all the existing platforms already try to have a complete integration with it, and they all fail… i would personally see a different way of thinking… using the default WP editor, which already contain hierachical/historical revisions history of all posts… with that, you simply need to add the proper wiki bbcodes inside the editor, which are available as plugins or can be created, which would simplify the integration…