this is all you really need to read (abstract/chapter intro...): New technologies represent a system of constraints and possibilities that constitute the foundation of new rhetorical spaces: the spheres of new communicative and persuasive procedures. Nowadays, urban planning has the chance to critically and rigorously experiment with these new spaces. It has the chance to transgress traditional representational codes and to expand its semantic horizons. This chapter portrays one such challenging exploration: the fecund crossroads between qualitative analytical approaches and digital languages within the planning field. It is a path that embraces diverse dimensions media and messages, analysis and rhetoric, ethics and aesthetics.

the "iWant" tool does not appear to work...nor is it very clear how it works. But, I think it is indicative of the kinds of data mining/harvesting approaches people are taking when it comes to "public" streams of discourse/conversation/knowledge that Twitter represents.