Abstract: A computer-implemented method of retrieving data in a data management system is disclosed. The data management system is adapted to enable system users to submit and share content items. Content items are stored in a database, each content item associated with an item creator. Activity data relating to user interactions with content items is also recorded. The activity data is analysed, the analysis comprising, for each of a plurality of users: analysing activity data relating to content items submitted by the user; and assigning a user classification to the user in dependence on the analysis of the activity data. Search requests are then processed by sorting retrieved content items in accordance with a sort order determined in dependence on user classifications assigned to the item creators of the retrieved content items.