This chapter takes up the issue of authenticity in language pedagogy. Traditional views of authenticity take the native speaker to be the primary authority for linguistic norms. Written standard language is especially highly valued here. It is argued herein that TELL environments are equally valid as learning environments, and that students can use the freedom they provide to develop their own locally negotiated cultural and linguistic norms. Evidence is provided that students on a net-based MA program develop their own norms for reducing language, and use them and other means to mark membership of a local TELL community. Thus, TELL is a rich and authentic environment for learners of English to become what is referred to as “language practitioners.”