Sentiment analysis is a stage in content processing where URLs with very negative content is annotated with the keyword sentiment:negative, see illustration below.
In Insight this can be used to filter articles with negative content. Futher, in Cxense Content and Cxense Advertising we DO NOT do contextual targeting on URLs which have been labeled with negative content. This is done to avoid potentially offensive advertising/content recommendation.
This feature is available for a limited set of languages, and can be enabled and disabled through the public Cxense APIs. More information about this feature is found here.