As another example, the message analyzer 232 may determine the similarity or time distance between the first and second communication sessions based on times associated with the first and second communication sessions. For example, if the second communication session is opened right after (e.g., in 10 seconds) the first communication session is opened and/or a text message in the second communication session is transmitted right after (e.g., in 15 seconds) an email message in the first communication is transmitted, the message analyzer 232 may determine that the first and second communication sessions have high similarity.
At step 324, if the message analyzer 232 determines that the first and second communication sessions have high similarity, the message analyzer 232 may determine that the first and second communication sessions share a common ground. As previously discussed, the common ground may include one or more of a common topic, a common subject, a common keyword, a common time (or a time common period), or any other common aspect of communication.