The spread of Internet and the latest Web developments have promoted the relationships between teachers, learners and institutions, as well as the creation and sharing of new Open Educational Resources (OERs). Despite this fact, many projects and research efforts paid more attention to content distribution focusing on their format and description, omitting the relationship between these materials and online communities of teachers. In this article we emphasize the importance of sharing resources in open educational communities (OEC), analysing the role of OERs and OEC in teachers' lifelong learning. Investigating their current usage, we aim to discover whether their interweavings could be an effective approach to support sharing of resources among teachers and to promote new educational practices. Through two surveys which involved more than 300 teachers from across Europe it was possible to highlight that is not simple to stimulate the collaboration among teachers, both online and face to face; nevertheless, when this happens, it seems to be a good way to promote formal and informal learning for teachers, as well as innovation in their professional practices.