18. A server device, comprising: a memory; and a processor to: receive a comment associated with a first document, the comment corresponding to a first portion of the first document, determine that a size of the first portion satisfies a threshold size, identify, based on determining that the size of the first portion satisfies the threshold size, a second document that includes a second portion that matches the first portion of the first document, store, in the memory, the comment in association with the first document and the second document, receive, from a client device, information indicating that the client device is accessing the second document, and provide, based on the information, the comment and another comment for presentation in connection with the second document for display by the client device, the processor, when providing the comment and the other comment for presentation in connection with the second document, being further to: generate a score for the comment with respect to the second document based on a degree of match between the first portion and the second portion, generate another score for the other comment with respect to the second document based on a degree of match between the second portion and a third portion, of the first document, that differs from the first portion, and provide, for presentation in connection with the second document, the comment relative to the other comment, the comment and the other comment being ranked in an order that is based on the score and the other score.
18. A server device, comprising: a memory; and a processor to: receive a comment associated with a first document, the comment corresponding to a first portion of the first document, determine that a size of the first portion satisfies a threshold size, identify, based on determining that the size of the first portion satisfies the threshold size, a second document that includes a second portion that matches the first portion of the first document, store, in the memory, the comment in association with the first document and the second document, receive, from a client device, information indicating that the client device is accessing the second document, and provide, based on the information, the comment and another comment for presentation in connection with the second document for display by the client device, the processor, when providing the comment and the other comment for presentation in connection with the second document, being further to: generate a score for the comment with respect to the second document based on a degree of match between the first portion and the second portion, generate another score for the other comment with respect to the second document based on a degree of match between the second portion and a third portion, of the first document, that differs from the first portion, and provide, for presentation in connection with the second document, the comment relative to the other comment, the comment and the other comment being ranked in an order that is based on the score and the other score. 27. The server device of claim 18 , where, when generating the score for the comment, the processor is to generate the score for the comment further based on one or more of: user feedback received in connection with the comment, an identity of an author who created the comment, or a timestamp indicating a date or time at which the comment was created or modified.