This document discusses how principles of urban planning can inform the design of social businesses. It argues that planning involves linking knowledge to action in the public domain to create socially rational outcomes, and that social media platforms aim to enable social transformation, making their designers planners. The document outlines lessons from urban planning like the roles individuals play in communities and how social comfort levels change as systems grow in scale and complexity. It suggests concepts like emergent paths, space vs. place, safe failure, and utopian visions can transfer to social business design.