I interpreted "Do not quote from Less Wrong itself" as things posted directly on this website, not as things posted anywhere by anyone who also happens to have an account on this website.
(Eliezer Yudkowsky and Robin Hanson are mentioned as specific exceptions.)
I also remember hearing that the point of that rule is to prevent the RQ threads to become echo chambers and therefore it should also apply to things LW regulars say elsewhere, but if so I'd very much rather the rule said that explicitly.
Another month, another rationality quotes thread. The rules are: