1. A method, comprising: by one or more computer systems, retrieving a plurality of comments associated with a content object; by the one or more computer systems, determining a score for each of the comments, wherein the score is based on one or more signals associated with the comment, and wherein the score is further based on a qualitative analysis of each of one or more impressions related to the comment, and wherein each of the impressions comprises an interaction by a historical user with the comment, wherein determining the score for each of the comments comprises: identifying a stop time associated with the comment and the historical user in an interaction log, wherein the stop time is indicated by an interaction associated with the historical user leaving or no longer viewing the comment, searching the interaction log backwards in logged time to identify a start time associated with the comment and the historical user, wherein the start time is indicated by an earliest interaction associated with the historical user viewing the comment, determining a viewing time of the comment based on the start time and the stop time, and determining sum of viewing time by all historical users who have interacted with the comment for certain time period, wherein the score for the comment is based on the sum of viewing time of the comment; by the one or more computer systems, ordering the comments based on the respective scores; and by the one or more computer systems, presenting one or more of the ordered comments to a target user.
1. A method, comprising: by one or more computer systems, retrieving a plurality of comments associated with a content object; by the one or more computer systems, determining a score for each of the comments, wherein the score is based on one or more signals associated with the comment, and wherein the score is further based on a qualitative analysis of each of one or more impressions related to the comment, and wherein each of the impressions comprises an interaction by a historical user with the comment, wherein determining the score for each of the comments comprises: identifying a stop time associated with the comment and the historical user in an interaction log, wherein the stop time is indicated by an interaction associated with the historical user leaving or no longer viewing the comment, searching the interaction log backwards in logged time to identify a start time associated with the comment and the historical user, wherein the start time is indicated by an earliest interaction associated with the historical user viewing the comment, determining a viewing time of the comment based on the start time and the stop time, and determining sum of viewing time by all historical users who have interacted with the comment for certain time period, wherein the score for the comment is based on the sum of viewing time of the comment; by the one or more computer systems, ordering the comments based on the respective scores; and by the one or more computer systems, presenting one or more of the ordered comments to a target user. 2. The method of claim 1 , wherein the qualitative analysis determines a category of interaction for the impression, the score is based at least in part on the category of interaction, and wherein the category of interaction comprises user input related to the comment.