Artículo presentado en el congreso TEEM en Salamanca. This paper presents a case of success MOOC (massive open online courses) that focuses on learning communities needed to achieve level of self-interaction of the cMOOCs, giving best results to promote knowledge also contributed by students. This MOOC was awarded with the first place of the “Iberoamerican Award Miríada X SEGIB”. This study reveals how the use and monitoring of virtual communities complemented by external tools, with engaging innovative methodologies and resources, has favoured these successful results. Publication: http://dl.acm.org/citation.cfm?id=2669893 Video Youtube: https://www.youtube.com/watch?v=sV4Uc7v43Bs