Systems and methods for bookmarking prospective media content on computer network. In some implementations, a method includes: at a server system, obtaining, from a electronic device, information corresponding to a media content item; identifying the media content item, from among a plurality of media content items, in accordance with the information; creating a provisional bookmark corresponding to a first URL where the media content item is not yet available but is likely to be available within a predefined time period; and transmitting the provisional bookmark to the electronic device. The method optionally includes: after creating the provisional bookmark, in accordance with a determination that the media content item has become available at the first URL, before the predefined time period: converting the provisional bookmark into a non-provisional bookmark.