After three very successful editions, the 4th European Summit on the Future Internet, jointly organised by SNT and TICE.PT, seeks to provide a forum for exchange and discussion for Internet practitioners. Presentations and discussions will focus on some of the most core issues with which the Internet of tomorrow will be confronted. At a time of massive data proliferation, of major economic uncertainty, of growing cyber threats and of rampant deindustrialization, understanding what Europe should plan for be in R&D or policy terms, becomes vital. By joining us you will have the opportunity to confront your views with those of the speakers, thereby contributing to inventing the future Internet.