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LiquidThreads is an unmaintained MediaWiki extension that implemented a new discussion page system. The original code was developed under sponsorship from the Google Summer of Code 2006, the Commonwealth of Learning, and Wikia, later continued by Andrew Garrett. It is used on some Wikimedia wikis.
After exploration and discussion, it was abandoned as a solution going forward for several reasons: poor performance, due to the way individual comments or posts are stored, parsed, rendered, cached, and assembled; no support for globally unique identifiers; and lack of flexibility with regards to workflows and collaboration techniques beyond simple discussion.