A server system comprising one or more processors and memory obtains user profiles for a plurality of users. In response to receiving profile-update information for a respective user, the server system updates a respective profile of the respective user in accordance with the profile-update information and initiates storage of profile-archive information that enables the server system to obtain a prior version of the respective profile. After updating the respective profile, the server system receives, from a requestor, a request for analysis of message interaction data. In response to receiving the request for analysis of the message interaction data, the server system obtains a message-interaction report that correlates the message interaction data with a set of one or more prior versions of profiles of one or more users that includes the prior version of the respective profile of the respective user and provides the message-interaction report to the requestor.