The present invention provides methods and systems for use in advertising campaigns and advertisement targeting. Techniques are provided in which streams of data, including communications data, are sampled, such as during transmission to intended recipients. Sampled data may be analyzed and used to determine topics of interest. Sampled data may be analyzed or filtered to determine data suspected of being of particular significance or relevance in determining topics of interest. Determined topics of interest may be used in advertisement targeting as part of an advertising campaign.
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