This work focuses on the characterization of adult lifelong learners' personal learning environments (PLEs) by implicit and explicit tools of personalization. It aims to create a system for the development of a learning path for the characterization of PLEs for adult lifelong learners. The synergy of formal and informal learning in the dynamic construction of a lifelong learner's PLE is fully explored, with the recognition that the majority of learning, especially for lifelong learners, occurs outside traditional learning formats. Specifically, this volume discusses the design, implementation, and validation of the SSW4LL (Social Semantic Web for Lifelong Learners) format and the SSW4LL system, built on Moodle 2.0 integrated with an adaptive mechanism (conditional activities) and some tools of Social Semantic Web (Semantic MediaWiki, Diigo, and Google+).