GNOSS (RIAM I+L Lab) is a software platform that sets up specialized online social networks with dynamic semantic publishing. GNOSS integrates knowledge management, informal learning and collaborative work in a Linked Data environment. Every GNOSS space incorporates semantic facet-based searches and semantic context creation which drasticaly improves user experience. We provide vertical solutions in Education through an educational graph of linked communities for social learning and connecting content as well as interests. Didactalia.net is a K-12 global community and an storage place for teachers, students and parents to create, share and find open educational resources that has currently more than 50.000 items with semantic contexts. We also offer a solution for University, that involves learn and research ecosystems based on communities and research groups enriched with personalized contexts. These contexts come from knowledge and scientific repositories that are semantically organized. Since 2011, we appear in the LOD Cloud (linkeddata.org), where we are leaders in educational ‘user-generated content’.