US Patent 8374975 Clustering to spread comments to other documents

A server device receives a comment associated with a first document, where the comment provides an opinion of, or remarks upon, a content of the first document. The server device obtains document clustering information which indicates that the first document is clustered with one or more second documents and stores, in a memory associated with the server device, the comment in association with the first document and the one or more second documents. The server device presents the comment in connection with the first document or one of the one or more second documents when the first document or the one of the one or more second documents is accessed by a user.