“…Yet, despite the scholarly community's rapid response to the lack of existing professional development (e.g., Aguilar, 2020a;Aguilar, 2020b;Greenhow & Chapman, 2020;Hickey et al, 2020;MacMahon et al, 2020), the pandemic disrupted established routines and contexts for professional development where such resources could be used. Social media, however, has been shown to be useful for "just-in-time" learning during a crisis (e.g., Greenhalgh & Koehler, 2017), so it is unsurprising that many did so during the pandemic (e.g., Fütterer et al, 2021;Greenhow et al, in press;Trust et al, 2020). We consider the details of teachers' use of social media prior to and during the pandemic to lend insight into their COVID-19 experiences while also offering answering broader questions focused on how teachers make decisions about their social media use.…”