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Researchers and developers still replicate ideas with low reuse when developing Web 2.0 applications. A domain engineering identify and document commonalities and variabilities of an application family fostering reuse. In this work, we used a domain engineering approach for content sharing features of social networks. We used as a method the FODA (Feature Oriented Domain Analysis) with patterns for computer-mediated interaction to describe the collaborative features and the 3C collaboration model to classify them. To implement the commonalities, a component kit was defined and developed, based on an infrastructure named Groupware Workbench. We conducted an experiment to evaluate the artifacts generated by the domain engineering.