Modern society is no longer a membership organization. The third status (i.e. being neither `friend' nor `stranger') has become constitutive of our everyday experience of other persons. And this everyday experience is that of indifference as our normal attitude towards most persons living in the world. A modern sociology of the stranger has to explore the facets of indifference. Indifference can be described as an interactional achievement in situations of fleeting contact. And it can be examined in its macrostructural consequences in a modern societal order in which motivations for societal engagements and therefore any willingness to care for the other are unavoidably scarce.