A server system receives a first request for access to content items from a user device associated with a user. In response to the first request, links to a plurality of content categories are sent for display on the user device. The content categories include a plurality of content items. Furthermore, a first group of content items determined to be relevant to the user is identified in accordance with one or more relevance criteria. The first group of content items includes a first subset of the plurality of content items. In response to the first request, links to the first group of content items are sent for display on the user device in addition to the plurality of content categories.