This paper examines social media platforms as spaces fostering their user’s self-transformation. This paper argues that the ethics of (illegitimate) technological influence can be expanded and enriched with a concept of situated agency and an enactive evaluation of adaptability afforded by an environment. The paper proposes a taxonomy to evaluate social media platforms as environments for self-transformation by using the concept of situated agency and a notion of enactive normativity. Using a situated concept of agency, we should look into how (...) an agent is afforded or even pushed to undergo transformative experiences while inhabiting a certain technical environment. To coin this taxonomy, the types of transformative experiences from Carel and Kid were used to show that one agent can effectively have four modes of formative agency in any given situation, namely how one responds to the pressures of an environment. However, since it could be argued that any kind of adaptation is legitimate since we become who we change into, this taxonomy adds an explicit normative dimension pertaining to the environment that fosters the agent’s transformation of the self: borrowing from the terminology of enactive theories of cognition, how an environment responds to an agent’s adaptation is also important and can make the difference between a hostile environment and a flourishing-conducive one. The paper shows how one can apply this taxonomy of formative agency to evaluate some of the most concerning cases of self-transformation triggered by social media platforms: online self-radicalisation, habit acquisition, and identity rigidification. (shrink)