Viral Communications at the Media Lab is all about how systems scale. We premiered scalable video in the '90s, we built scalable mesh radios into the 2000s, and now we consider how AI will scale as it becomes part of everyday life. We are at an inflection point. We are inventing machines that are more than open-loop amplifiers of human effort, they are becoming closed-loop. Our challenge is to build a symbiotic loop in which both people and machines form a mutually supportive pair. We go past P2P and consider P2M: relationships between people and machines, as creative, exploratory partners. We now build scalable collaboration systems. We show application and impact for how we learn beyond schools, how we engage in commerce beyond web3, and how society interacts.