Recent technological advances foster the spreading of social software in the mobile domain. Hence, future usage patterns of mobile devices will involve more group interaction. While collaboration using mobile devices is an active area of research, only limited attention has been paid to the efficient initiation of group communication from mobile terminals. In this paper we present a community-aware mechanism that allows to efficiently select contacts in order to address them as a group. We have integrated the proposed method into a proof-of-concept application, and present preliminary experiments that demonstrate the accuracy of the approach and show significant time savings in the group initialization process. Categories and Subject Descriptors H.5.3 [Information Systems]: INFORMATION INTERFACES AND PRESENTATION—Collaborative computing, Group and Organization Interfaces General Terms Human Factors, Algorithms