The idea of a Situated Story has ancestors in the Locative Story, the Transmedial Story, the Installation, and probably in site specific performance.
A main reference point is the research of Henry Jenkins, as published in Convergence Culture – where old and new media collide, with a couple of important differences and additions. A Situated Story is a transmedial work, woven into a site, or number of sites. Read on in >>>Situated Storytelling