This paper analyzes the relations between technodiscourse, interactivity and support in Instagram media in a theoretical intersection between Digital Discourse Analysis (Paveau, 2017), Communication Sciences (Jensen, 1998; Kiousis, 2002) and Textual Linguistics (Marcuschi, 2003, Gonçalves, 2013). The corpus is composed of screen copies of stories from the Portuguese newspaper Correio da Manhã and the Brazilian newspaper Diário Catarinense published on Instagram. In this investigation, we verified that some aspects of technodiscourse, such as composition, delinearization, augmentation, and relationality are directly related to two levels of interactivity, the dialogic character and content control. Therefore, a degree of engagement of interlocutors in interactions with Instagram media are increased. We also verified that some variables of interactivity, such as the control of content and the dialogical character, change depending on the type of support through which the Instagram media is accessed, in order to stimulate the interlocutor to more direct and active actions in the construction of meanings. This research seeks to show the relevance of observing the characteristics of technodiscourse combined with the investigation of interactivity and support in the construction of meanings of Instagram stories. With this contribution, we seek to expand the studies that relate technodiscourse to modes of interaction with digital media. [ABSTRACT FROM AUTHOR]