The described implementations relate to communication platforms that are provided over computer networks. One implementation provides a system that can include a storage component configured to store a plurality of communications having a common connector. The system can also include a score computation component that is configured to compute scores reflecting semantic relationships between individual communications from the plurality of communications. The system can also include a summary generation component that is configured to select one or more of the individual communications, based on the scores, and generate a summary of the common connector. The summary can represent the selected individual communications. The system can also include at least one processor configured to execute one or more of the components.