One face in the crowd meets another. Eyes lock, only to disappear again. Craigslist missed connections, a minor genre of the personal ad, reveal the imbrication of mediation and missing. They articulate anxieties over shifting relations in cityscapes and communication infrastructures. This article treats missing as an act and affect defined through mediation. Studying a vernacular narrative form such as the missed-connections ad offers insight on the significance of missing to urban life. The architecture of missed connections shows that they (...) trace and generate connections among physical, transit, and media infrastructures. Articulating a moment of loss and hope for recuperation, missed connections look simultaneously backward and forward in time. They describe interactions at once mundane and unique, leaving gaps that invite projection. These entextualizations of in-person encounters inspire various forms of remediation. These acts come to reanimate cities as spaces where surprise moments of fleeting intimacy can reveal themselves at any moment. (shrink)