This thesis project concerns the development of a local web-based system for people in the 3rd age, which should help to strengthen their social network. The focus has been on co-creating a solution, together with seniors, which corresponds to the needs and considers the abilities of the users. The co-creation process has furthermore been used as a way to overcome the boundary between elderly and technology. This has been done by use of a reverse engineering approach, by first detecting the core mechanisms connected to social networking, and gradually building up a solution.