Some work scenarios foster the adoption of people-driven, dynamic and geo-located processes. To support such scenarios, we suggest two fundamental changes in process structure and control. Regarding structure, we move away from traditional process models towards process contexts, which can be organized around geographical locations. Regarding control, we move away from model-based control-flow towards dynamic activities defined by the participants as processes unfold. This research makes the following unique contributions: 1) It provides the first implementation of people-driven dynamic processes; 2) It provides the first implementation combining people-driven dynamic processes and geographical context; 3) Finally, it provides a unique approach to build process context, which leverages the possibilities brought by microblogging platforms in exchanging semi-structured and unstructured messages.