Abstract : 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 agentivity in discourse elaboration, especially technological. Then we expose our theoretical frame and methodological choices grounded on the concepts of technodiscursivity, ambient affiliation, serachable talk and produsage. At last we examine the tweet as a specific technodiscursive form, and the hahstag as a technoforme which strongly organizes discursivity on the microblogging network.