16. The method of claim 1 , wherein the quotation-score is further based on a quotation quality of the quotation.
1. A method comprising, by one or more computing devices: accessing, by the one or more computing devices, a plurality of communications authored by one or more users of an online social network, each communication being associated with a particular content item and comprising a text of the communication; extracting, for each of the plurality of communications, one or more quotations from the text of the communication; determining, for each extracted quotation, one or more partitions of the quotation; grouping, by the one or more computing devices, the extracted quotations into one or more clusters based on a respective degree of similarity among their respective one or more partitions; calculating, by the one or more computing devices, a cluster-score for each cluster based on a frequency of occurrence of one or more partitions of one or more quotations in the cluster in communications associated with the particular content item; calculating, by the one or more computing devices, a quotation-score for each quotation in a cluster having a cluster-score greater than a threshold cluster-score, wherein the quotation-score is calculated based on the following expression: q+Σ i=0 n (α×similarity metric), wherein q is a count of occurrences of quotations that are exact matches and α is a respective count of occurrences of quotations that are not exact matches in a total set of unique extracted quotations defined from i=0 to i=n, and wherein the similarity metric is a measure of a degree of similarity between a quotation that is an exact match and the respective quotation that is not an exact match; and generating, by the one or more computing devices, a quotations-module comprising one or more representative quotations, each representative quotation being a quotation from a cluster having a cluster-score greater than a threshold cluster-score, and each representative quotation having a quotation-score greater than a threshold quotation-score.