1. A computer-implemented method comprising: receiving a plurality of a particular user's interactions with a plurality of items in a social networking system, each item associated with a category; ranking the items based on the particular user's interactions with the items, the ranking based at least in part on an interaction type for each interaction with an item; for the particular user, ranking the categories based on the item rankings of the items within each category; for the particular user, generating by the social networking system a bookmark link for each item, each bookmark link providing a link to the corresponding item in the social networking system; and sending the bookmark links grouped by category to the particular user for display, the bookmark links ordered within each category based on the item rankings of the corresponding items within the category, and the categories ordered based on the ranking of the categories.