I used it simply in its literal Latin interpretation which is "it speaks for itself". However, if you want a legal interpretation res ipsa Loquitor is a rule of evidence, not substantive law. For your contributory negligence position to be valid it must be demonstrated that the other party's posting was either within the rules or, at a minimum, extralegal, (that is not covered by the rules,) which clearly isn't the case. Non obstante veredicto.