Social media identity is manufactured by underlying material infrastructures, not expressed by users.

Evidence

In looking slightly beyond what we see in the foreground of images and videos on social media, we begin to see the material infrastructures of a capitalism organized around the production of identity, in which the means of production become the means of production of the self, a transformation that affirms an evacuation and undermining of subjectivity beyond what cannot be equated with a saleable commodity. — Grant Bollmer, Katherine Guinness, The Influencer Factory, 59