1. A computer system that acts as an intermediary between user computing devices and content sources, the computer system comprising at least one or more computing devices, each of the one or more computing devices comprising a processor and a memory, wherein the computer system is programmed to at least: retrieve a plurality of requested content pages in response to a plurality of requests from user computing devices; generate opinion data regarding one or more of the plurality of requested content pages, wherein opinion data regarding a particular content page of the plurality of requested content pages reflects an opinion in the particular content page regarding a topic of the particular content page, and wherein the opinion data regarding the particular content page further reflects a classification of the opinion as one of a positive opinion, a neutral opinion, or a negative opinion regarding the topic of the particular content page; transmit, to a first user computing device, a first content page reflecting a first opinion regarding a first topic, wherein the first user computing device presents the first content page with an option to access a content page associated with an opinion regarding the first topic differing in classification from the first opinion; receive, from the first user computing device, a request corresponding to activation of the option; identify, based at least partly on the opinion data, a second content page associated with a second opinion regarding the first topic that differs from the first opinion regarding the first topic, wherein identifying the second content page comprises determining that a classification of the second opinion, as one of a positive opinion, a neutral opinion, or a negative opinion, regarding the first topic is different than a classification of the first opinion regarding the first topic; transmit, to the first user computing device, response data regarding the second content page, wherein the first user computing device is configured to provide a user interface option to submit feedback, to the computer system, regarding at least one of the first opinion or the second opinion, and use the feedback to classify at least one of the first opinion or the second opinion.