Systems and methods are described that facilitate exploration and mining of a corpus of documents using concepts and knowledge, rather than keywords and enable interactive visualization, management, monetization, and personalization of knowledge search results on a user interface. Underlying documents can be mapped into overlapping clusters of knowledge dimensions and the documents can be further partitioned into narrower knowledge dimensions, resulting in a hierarchical structure. Content of knowledge dimensions may be filtered using a knowledge dimension map. Knowledge may be personalized by a user and shared in collaborative and social networks. Knowledge-based advertisement systems and methods are described that associate products and services with knowledge dimensions and concepts. Advertisers can bid on concepts and KDs. Systems and methods are described that distribute a percentage of CPC revenue among content owners and provide revenue to content providers based on relevancy scores.