Abstract: A method comprising for determining the value provided to an advertiser through the advertiser's online advertisements. The method may begin with providing an online advertisement linked to content. A macro-context may be obtained that quantifies the affinity of the content for a plurality of domains corresponding to a semantic space. A personalization vector may be obtained that quantifies the affinity of at least one aspect of a user for the plurality of domains. The user may then select the online advertisement. A match value may be calculated that quantifies the similarity between the personalization vector and the macro-context. The advertiser may then be charged a monetary amount for the user's “click.” The monetary amount may be based, at least in part, on the match value.

Abstract: A data extraction tool is provided for cataloging information in an information source for searching by a user. The tool mines information from the information source and organizes the information, or the locations of that information, within a database. A user may then query the tool for a desired type of information. The tool filters the database to provide a set of pinpoint site locations with information of the type requested in the query. These pinpoint site locations are presented to a user and indexed for future reference. The index of site locations may be updated automatically by the tool. A context system is provided for manually or automatically determining the proper context for a user's query. Thus, the data extraction tool provides information with a high probability of relevance to the user. The user obtains the information without expending much effort to refine the search.