The idea of exploring a global interconnectedness is excellent, and I think you chose the tools wisely for your students to deliver their message! I really like the idea of each group having a different country/region to work on, and I think that a timeline is a great tool for them to visualize such complex information more clearly. My concern is about the construction of their knowledge. Where will they find the information necessary to build their timelines? How will that be structured? Further, in order to build these timelines, what kind of scaffolding techniques will be used to support their reasoning? Since the target audience is Grade 7, specific directions are still needed for students to meet expectations and standards.
Where will Edmodo be used? It has only been listed under Prerequisite Knowledge.