That’s a fair question! I did not primarily mean a particular empirical community like, say, modern Westerners, TPF participants, scientists, or the members of some Habermasian public sphere. And I didn’t either mean that truth is constituted by whatever some actual “we” happens to agree upon. I may be referring to what it is j_j refers to as “the forum” (singular) though my account of truth may be somewhat different than theirs. Contingently being a participant in our specifically human form of life just is what it is to be a member of the forum.
My use of “we” was therefore meant in a more Wittgensteinian and practical-transcendental sense. A judgment can be my judgment only if it is an exercise of a capacity that is repeatable, correctable, and intelligible as the same kind of act across occasions. If I judge that something is blue today, and later wonder whether I judged rightly, or whether I now mean by “blue” what I meant before, I am already treating my judgment as belonging to a persistent pattern of use. That pattern is not an instantaneous private occurrence. It belongs to a form of life.
And such a form of life is essentially shareable, even when it is not actually shared by everyone. The same features that make my judgments answerable to my own past and future uses also make them, in principle, answerable to the uses, corrections, and challenges of others who can participate in the same practice of giving and asking for reasons (both reasons for believing things and for doing things). My having two takes at different times on the same object is not, in this respect, fundamentally different from two speakers having different takes on the same object at the same time. Both cases presuppose criteria of sameness, correction, and possible disagreement.
So the “we” in my formulation is not a sociological placeholder for a privileged community. It names the essentially shareable structure of judgment and agency (which also constitutes a locus for potential disagreement). Of course, actual communities are historically situated, unequal, fallible, and often in conflict. But the very possibility of criticizing a community’s standards, expanding them, translating between allegedly different “forms of life,” or discovering that some voices were wrongly excluded already presupposes that judgment is not a sealed private episode. It is answerable both to the world (our world) and to norms that can, in principle, be endorsed, challenged, and revised by others.