Seedwiki
Seedwiki.com is probably the easiest large public wiki to use. It is a wiki farm with proprietary technology and its own unfortunate notation that does not meet the wikitext standard. However it is free and one can set up groups on it in minutes, and have them productive within hours. It is used by a good many groups that Consumerium Services would want to serve or reach or recruit as contributors to the Research Wiki in particular.
It is probably part of the healthy signal infrastructure somewhere...