19. A non-transitory computer storage medium comprising a browser component configured to execute a process on one or more computing devices, the process comprising: providing a first user interface option to access content associated with an opinion that differs in classification, as one of a positive opinion, a neutral opinion, or a negative opinion, from a classification of a first opinion, of a first content page displayed by the browser component, regarding a topic of the first content page, wherein the first opinion is classified as one of a positive opinion, a neutral opinion, or a negative opinion regarding the topic, wherein a network-accessible computer system stores opinion data classifying the topics of a plurality of content pages from a plurality content sources; in response to activation of the first user interface option, receiving, from the network-accessible computer system, response data comprising a second content page associated with a second opinion regarding the topic of the first content page, wherein the network-accessible computer system transmits the second content page upon identifying that the second opinion differs in classification from the first opinion as one of a positive opinion, a neutral opinion, or a negative opinion; and providing a second user interface option to submit feedback, to the network-accessible computer system, regarding at least one of the first opinion or the second opinion, wherein the network-accessible computer system uses the feedback to classify at least one of the first opinion or the second opinion.
19. A non-transitory computer storage medium comprising a browser component configured to execute a process on one or more computing devices, the process comprising: providing a first user interface option to access content associated with an opinion that differs in classification, as one of a positive opinion, a neutral opinion, or a negative opinion, from a classification of a first opinion, of a first content page displayed by the browser component, regarding a topic of the first content page, wherein the first opinion is classified as one of a positive opinion, a neutral opinion, or a negative opinion regarding the topic, wherein a network-accessible computer system stores opinion data classifying the topics of a plurality of content pages from a plurality content sources; in response to activation of the first user interface option, receiving, from the network-accessible computer system, response data comprising a second content page associated with a second opinion regarding the topic of the first content page, wherein the network-accessible computer system transmits the second content page upon identifying that the second opinion differs in classification from the first opinion as one of a positive opinion, a neutral opinion, or a negative opinion; and providing a second user interface option to submit feedback, to the network-accessible computer system, regarding at least one of the first opinion or the second opinion, wherein the network-accessible computer system uses the feedback to classify at least one of the first opinion or the second opinion. 21. The non-transitory computer storage medium of claim 19 , the process further comprising: causing, in response to receipt of the response data, presentation of at least one of: at least a portion of the first content page, a summary of at least a portion of the first content page, or a user interface option to retrieve the first content page.