Abstract: A content server generates an ad review display that allows users to review previously-presented ads. The content server provides a stream of media content to a client device for presentation to a user of the client device, and generates an ordered list comprising ad tiles corresponding to ads presented to the user with the stream of media content. The content server generates an ad review display based on the ordered list. The ad review display comprises one or more ad tiles organized along a first axis of the ad review display according to their position in the ordered list. The content server sends the ad review display to the client device for presentation to the user. Responsive to receiving a request to replay a previously-presented ad from the client device, the content server inserts the ad into the stream of media content being provided to the client device.

Abstract: Methods of defining ontologies, word disambiguation methods, computer systems, and articles of manufacture are described according to some aspects. In one aspect, a word disambiguation method includes accessing textual content to be disambiguated, wherein the textual content comprises a plurality of words individually comprising a plurality of word senses, for an individual word of the textual content, identifying one of the word senses of the word as indicative of the meaning of the word in the textual content, for the individual word, selecting one of a plurality of event classes of a lexical database ontology using the identified word sense of the individual word, and for the individual word, associating the selected one of the event classes with the textual content to provide disambiguation of a meaning of the individual word in the textual content.

Abstract: Processes, data structures, and apparatuses to represent knowledge are disclosed. The processes can comprise labeling elements in a knowledge signature according to concepts in an ontology and populating the elements with confidence values. The data structures can comprise knowledge signatures stored on computer-readable media. The knowledge signatures comprise a matrix structure having elements labeled according to concepts in an ontology, wherein the value of the element represents a confidence that the concept is present in an information space. The apparatus can comprise a knowledge representation unit having at least one ontology stored on a computer-readable medium, at least one data-receiving device, and a processor configured to generate knowledge signatures by comparing datasets obtained by the data-receiving devices to the ontologies.