Opinion polling and voting can be utilized in talk pages and throughout the various
administrative and bureaucratic processes of wiki communities.
Opinion polling and voting are available for MediaWiki through a number of extensions. A
popular one is SecurePoll which has been “used for Wikimedia Foundation Board elections
and arbitration committee elections, and was used for the Wikimedia license transition
vote among other things” (https://www.mediawiki.org/wiki/Extension:SecurePoll
I recently read about an interesting software, Vocdoni (https://vocdoni.io/
), which utilizes peer-to-peer technology and blockchain to
provide opinion polling and voting. Perhaps there will, one day, be MediaWiki extensions
for interoperation with such systems.