The examples included in this chapter are the basis of working for the SociAgg application. The application is intended to aggregate information from social portals, such as Facebook or Twitter, and will be under development in the next chapters. Extensive code was necessary in this chapter, along with very important information and "must have" things. I think we learned a lot about best practices in MVVM development and application development in general. The understanding of the MVVM pattern is just an implementation; there are other implementations and toolkits but I think the mechanisms and patterns shown here will be a very good solution in most cases and problems.