The popularity of social media focuses our attention on designing for conversations. Increasingly we create social digital spaces that are instant, ambient, and ubiquitous. What are the conversational resources that we use in offline conversation that we need to take into account when designing these spaces? What is the difference between an online and offline conversation, if any? These are some of the questions we will consider as I review what ethnomethodologists know about how people converse in person and in technologically mediated contexts.