Within the semiotic framework proposed by A. J. Greimas, a distinction is made between symbolic, semi-symbolic, and semiotic, with the semi-symbolic system embodying the homologation between the planes of expression and content. In the context of contemporary social media, semi-symbolic signs, manifested through gestures, images, emoticons, and filters, construct a complex system of meaning exchange. This manifestation of enunciative praxis, grounded in a value system, not only signifies the coherence of discourse but also illustrates the equilibrium between the planes of expression and content. The concept of Umwelt, introduced by J. V. Uexküll, further enriches our understanding of social media environments as integral parts of individuals' life-worlds, where these sign systems frame our perception and interpretation of the world. This article aims to delineate and explore the definition and functionality of the semi-symbolic system within social media, analyzing how signs contribute to the construction of body narratives—from idealized body images in advertisements to selfie photos enhanced by filters. It examines how social media, as a cultural sphere, employs signs to build and disseminate aesthetic standards, thereby generating mechanisms of body anxiety. Consequently, it is deduced that semi-symbolic signs serve not only as perceptible objects but also as semiotic modeling that sculpt our innewelt, influencing our cognition and emotional experiences.