14. One or more devices comprising: a comments database that stores comments associated with documents; a searching component to receive a request for comments associated with a particular document and to identify the comments by searching the comments database, where the request for comments is associated with a particular user; a ranking component to rank the identified comments based on a combination of objective scores and subjective scores, comprising: an objective ranking component to generate the objective scores for comments, where the objective scores are independent of the particular user, and a subjective ranking component to generate the subjective scores for comments, where the subjective scores depend on the particular user; and an interface to provide, to a client device associated with the user, the ranked comments for presentation in connection with the particular document.
14. One or more devices comprising: a comments database that stores comments associated with documents; a searching component to receive a request for comments associated with a particular document and to identify the comments by searching the comments database, where the request for comments is associated with a particular user; a ranking component to rank the identified comments based on a combination of objective scores and subjective scores, comprising: an objective ranking component to generate the objective scores for comments, where the objective scores are independent of the particular user, and a subjective ranking component to generate the subjective scores for comments, where the subjective scores depend on the particular user; and an interface to provide, to a client device associated with the user, the ranked comments for presentation in connection with the particular document. 16. The one or more devices of claim 14 , where the objective ranking component generates the objective score for a particular comment based on objective ranking parameters that include at least one of: a measure of relevance of the particular comment to the particular document, a linking structure of the particular comment, a reputation of an author of the particular comment, a rating of the particular comment, a timestamp of the particular comment, a length of the particular comment, and a spelling and grammar score of the particular comment.