Understanding the affordances that networked platforms offer is a good place to start rethinking our notions of learning. The article discusses how social connectivity has changed, arguing that networking and networks have become foregrounded in how we perceive and experience our (digital) social worlds. Our aim is to understand the nature of networked structures, and the networked practices that these have enabled, to shed light upon how they 'work' for learning. While making use of the concept of affordances, the article discusses a selection of four affordances of digital networks (visibility, scalability, flexibility and persistence) and argues how these impact upon opportunities to learn through social media. The article finally critically reflects on how sociocultural theories of learning need expansion and revision, given social changes involving the rise of social media, but it also shows how this perspective leads the way in pointing to new challenges for theorising learning.