This CIDER session considers formal and informal learning activities in massive open online courses (MOOCs). MOOCs are often broadly positioned as either cMOOCs (based on connectivistic pedagogies) or xMOOCs (based on cognitivistic/behaviouristic pedagogies). This presentation provides findings from an in situ case study - examining an emergent, hybrid MOOC design - focused on establishing the presence of both formal and informal learning activities in a network-based hybrid approach to MOOC design. The establishment of these two activity systems extended to include opportunities for boundary crossings between them. An outcome is a cultural-historical activity theory (CHAT)-informed model that extends commonly used and recognized MOOC typologies.