11. A computer-implemented method for prospecting digital information through online social communities, comprising: maintaining a home evergreen index for a home community and a plurality of frontier evergreen indexes for respective frontier communities, the home evergreen index and the frontier evergreen indexes covering topically-limited subject areas, each of the subject areas comprising electronically-stored digital information, the home evergreen index and each frontier evergreen index comprising: defining a hierarchy of stored topics; and matching a stored topic model to each of the topics in the topic hierarchy, each of the topic models comprising a pattern evaluable against the digital information, wherein the pattern identifies such digital information matching the topic model's topic; identifying at least one frontier evergreen index that comprises stored topics that are at least partially distinct from the stored topics comprised in the home evergreen index; obtaining vetted assessments as provided by the frontier community of the at least one frontier evergreen index for articles of the digital information identified by the patterns that comprise the topic models of the at least one frontier evergreen index; selecting the articles of the digital information corresponding to the vetted assessments that are favorable and matching the patterns that comprise the topic models of the home evergreen index against the selected articles of the digital information; and providing the selected articles of the digital information that were matched on a display.
11. A computer-implemented method for prospecting digital information through online social communities, comprising: maintaining a home evergreen index for a home community and a plurality of frontier evergreen indexes for respective frontier communities, the home evergreen index and the frontier evergreen indexes covering topically-limited subject areas, each of the subject areas comprising electronically-stored digital information, the home evergreen index and each frontier evergreen index comprising: defining a hierarchy of stored topics; and matching a stored topic model to each of the topics in the topic hierarchy, each of the topic models comprising a pattern evaluable against the digital information, wherein the pattern identifies such digital information matching the topic model's topic; identifying at least one frontier evergreen index that comprises stored topics that are at least partially distinct from the stored topics comprised in the home evergreen index; obtaining vetted assessments as provided by the frontier community of the at least one frontier evergreen index for articles of the digital information identified by the patterns that comprise the topic models of the at least one frontier evergreen index; selecting the articles of the digital information corresponding to the vetted assessments that are favorable and matching the patterns that comprise the topic models of the home evergreen index against the selected articles of the digital information; and providing the selected articles of the digital information that were matched on a display. 12. A method according to claim 11 , further comprising: comparing the topically-limited subject areas of the home evergreen index to the respective topically-limited subject areas for a plurality of the frontier evergreen indexes; and selecting the at least one frontier evergreen index from the plurality of the frontier evergreen indexes based on domain-informed evaluation of the comparisons.