December 11th, 2020 marked our final #teslONchat of the year. We gathered on Twitter to discuss Instructional Design with Anna Bartosik (@ambartosik). Anna is a doctoral candidate, an instructional designer, a teacher, and a teacher trainer. Anna develops online and blended courses and works on curriculum development. Her interest in self-directed professional development informs her work as a teacher and instructional designer, but also inspired her research of teacher professional development on social media platforms, like Twitter.