When Social Media Reshapes Academic English: Digital Register Drift and Hybrid Communication among Vietnamese EFL Students

In the era of digital communication, social media has increasingly transformed how English as a Foreign Language (EFL) students communicate, interact, and construct linguistic identities. While previous studies have primarily focused on the effects of social media on language learning outcomes, relatively limited attention has been devoted to its influence on stylistic norms, academic discourse practices, and register control. This study investigates how social media-mediated communication contr