Systems, methods, and computer program products to perform an operation comprising identifying, in a first thread comprising a plurality of messages outputted for display on a display device, a first concept in a text of a first message of the plurality of messages, identifying a second concept in a text of a second message of the plurality of messages of the first thread, upon determining that the second concept is different than the first concept, generating a second thread comprising a subset of the plurality of messages, wherein each message in the subset of the plurality of message is related to the second concept, and outputting, based on a set of user preferences, the subset of the plurality of messages of the second thread for display on the display device.