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Software applications that can be changed, modified and extended are nowadays pretty mainstream. But only few researchers focused on the role of the users social network for actual modifying practices and hurdles. Therefore this paper, studies in a comparative manner, how users modify software applications by using markets of existing components. We examine two popular applications: the universal tool platform Eclipse as an example for work applications and the game of World of Warcraft as an example for leisure applications. Despite the difference of the contexts, we found common patterns in collaborative actions within the social networks, that lead us to discuss the role of sharing and support for modification awareness for end users.