4. The method of claim 1 , wherein the markup document corresponds to a weblog page.
1. A computer-implemented method for modifying a display of content that includes a first portion that was previously displayed to a user, the method comprising: under control of one or more computer systems configured with executable instructions, receiving a request for content to be displayed to a user, the content being associated with a markup document that is associated with a first URL such that the content is retrievable by accessing the markup document from a location specified by the first URL; retrieving the content associated with the markup document; determining if difference information is available, the difference information indicating a difference between a previous version and a current version of the markup document, the previous version having been presented to the user; accessing user activity tracking information to determine portions of the markup document that were previously displayed to the user; based on the difference information and the user activity tracking information, determining portions of the current version of the markup document that have not previously been displayed to the user; providing the markup document for display to the user at a client system, the content of the markup document including one or more intra page bookmarks indicating portions of the content that were not previously displayed to the user; enabling the user to use the intra page bookmarks to view the portions of the markup document that were not previously displayed to the user; enabling the user to manually insert intra page bookmarks in the markup document allowing the user to start at a desired location after closing the markup document; and enabling the user to selectively choose to display or not display the intra page bookmarks.