This paper shows that Twitter discourses can't be analyzed out of their ecosystem. They are native online writings, which constitute hybrid materials incorporating a technological dimension, and they must be observed in their environment, through the users-speakers points of views. We first present the epistemological framework of the study, within a postdualist perspective which allows to lead a symmetrical linguistics, that is to say a way of considering nonhuman materialities and agentivity in discourse elaboration, especially technological. Then we expose our theoretical frame and methodological choices grounded on the concepts of techno-discursiveness as ambient affiliation, searchable talk and produsage. At last we examine the tweet as a specific techno-discursive form, and the hashtag as a techno-form which strongly organizes discursiveness on the micro-blogging network.