Hmmm... the notion of Pareto optimality is driving political tactics (about what voting method to back)? I know what it means, and it seems strange to me. This suggests that a specialized economic term was used as a motivation for a tactical political decision.
Their forum and Google Group for discussion of voting systems were good resources, but are now being shut down
https://forum.electionscience.org/t/archiving-the-forum-july...
https://groups.google.com/g/electionscience
"This change reflects CES’s gradual evolution from an academic organization to an advocacy organization."
A volunteer-run forum has been created to replace it, but is pretty quiet so far.
http://reddit.com/r/EndFPTP is also a good "non-partisan" resource, as well as https://electowiki.org/wiki/Main_Page