Abstract: In some examples, a facility chooses documents for recommendation to people interested in a distinguished subject. The facility accesses a data resource indicating, for each of a plurality of documents, (1) a subject semantically determined for the document, (2) a number of people who have interacted with the document, and (3) an aggregate level of intensity with which those people have interacted with the document. Based on contents of the data structure, the facility identifies one or more documents (1) for which the distinguished subject has been semantically determined, and (2) with which a relatively large number of people have interacted and/or with which people have interacted with a high aggregate level of intensity. The facility transmits to another computing system data configured to cause the first computing system to present a recommendation for some or all of the identified documents.

Abstract: In some examples, a facility chooses documents for recommendation to people interested in a distinguished subject. The facility accesses a data resource indicating, for each of a plurality of documents, (1) a subject semantically determined for the document, (2) a number of people who have interacted with the document, and (3) an aggregate level of intensity with which those people have interacted with the document. Based on contents of the data structure, the facility identifies one or more documents (1) for which the distinguished subject has been semantically determined, and (2) with which a relatively large number of people have interacted and/or with which people have interacted with a high aggregate level of intensity. The facility transmits to another computing system data configured to cause the first computing system to present a recommendation for some or all of the identified documents.

Abstract: A facility for attributing subject categories to documents in a set of documents collected on behalf of the user is described. For each document in the set of documents, based on semantic analysis of the document, the facility identifies one or more direct subjects for the document. The facility attributes to the document the direct subjects identified for the document. Based on semantic analysis across the documents of the set, the facility identifies one or more collective subjects each for a proper subset of the set of documents. The facility attributes each identified collective subject to each document of the subset of the set of documents for which it was identified.