The issue of women in IT has attracted voluminous research with many theories framing discussions, such as Essentialist Theory, Social Construction Theory, Individual Differences Theory, Structuration Theory, Theory of Reasoned Action, and their resulting Gender Modelling, Leaky Pipeline, Life Course Approach, Critical Mass, and Dualism Models. Key theories are critically examined in this chapter, and it is concluded that not only have no real world benefits ensued, but in some cases the theories themselves may be part of the problem by negatively framing expectations. However, the years of research should not be wasted: rather, the tools of #SocialIT, such as hackfests, should be applied to gain deeper and wider understanding. The new STEMcell Model is most similar to the Life Course approach and within-gender variants of Gender Theory. However, it goes further to identify an individual's interests and talents as more drivers in themselves than something passively shaped by society. External influences and barriers do exist but need to be considered in the context of the individual, not the other way around, and those barriers will be swept away by the tools and effects of #SocialIT.