Different socio-historical conceptualisations of the emergence of public op
inion in the eighteenth century, which have given rise to the works of Habe
rmas about the public sphere, in particular, allow us to think about the ac
tual social referent of the public opinion phenomenon. The classical focus
on prerevolutionary, enlightened public opinion and the hypothetical causal
effect of the Enlightenment conceal the anthropological invariants of opin
ing as a procedure of sharing differences and individual interests. This "i
ntello-centric" approach reproduces the elitist ideology in this analysis t
hat limits the procedural universality to the pseudo-public sphere of the "
true" citizens, although it declares, as a matter of principle, that all ci
tizens aught to participate in government. After having proven the segregat
ing stakes in these processes, the article shows that the concept of public
opinion is not reduced to a normative definition - either in the cultivate
d sense of a rational discussion or in the psyche-sociological sense of an
aggregation of individual states of mind - by the community of scholars and
politicians. It also refers to the common opinion and the popular form of
speech which characterise the "doxastic" community of mutual knowledge that
ordinary actors hold, or think they hold, about each other.