“Either Companionship or Death”: Zero-Directionality and the Structural Disappearance of the Social Other

Digital platforms produce a paradox: unprecedented connectivity alongside rising loneliness. Existing frameworks—built on assumptions of human senders and receivers—cannot explain this because the structure of communication has fundamentally changed.This paper introduces directionality as a formal variable tracing platform evolution from bidirectional social graphs, through unidirectional interest graphs, to Zero-Directionality: human–machine interaction in which the social other is entirely absent.We show that this zero-degree threshold enables two divergent trajectories. In the Inverted Loop (negative directionality), algorithms act preemptively, shifting the human from operator to operand. In the Triadic Mesh (triadic directionality), AI mediates between humans rather than replacing them, preserving human connection.Drawing on platform analysis, we examine how these trajectories reconfigure agency, citizenship, and social life, and identify degradation risks when mediation drifts into substitution. The framework extends platform studies to environments where the machine is communicative agent rather than intermediary.