1. A computer-implemented method, comprising: receiving a search request sent by a computer associated with a user; identifying a set of documents comprising a plurality of documents that satisfy the search request, wherein at least some documents in the plurality of documents have previously been annotated by at least one user of a plurality of users; and sending a response to the search request, the response including: a ranked set of links to at least some of the plurality of documents that satisfy the search request, wherein at least some of the links are to documents that have previously been annotated by at least one user of the plurality of users, and wherein the response is associated with: instructions to display one or more corresponding annotations for at least some of the links to documents that have previously been annotated by at least one user of the plurality of users, and instructions to display a filter selector including one or more filter options to reduce the identified set of documents.