Social software makes it possible to involve large user groups in innovation projects. In the Monimos case study an online innovation space was used for designing a social media service for a network of multicultural associations. Immigrant representatives participated in the core design team in regular face to face meetings and workshops. Additionally an online design space was used to make participation in certain design activities open for the public. Although open innovation may result in better solutions, a lot of facilitation is needed in order to integrate online contributions efficiently into the web service development process. In this paper we present the challenges of combining open and restricted design spaces with different participant groups.