40. A method comprising: maintaining at an annotations repository system a plurality of annotations collections, each of the plurality of the annotations collections having been authored by an associated annotations author and corresponding to an associated webpage, such that each of the plurality of the annotations collections includes one or more annotations relating to corresponding one or more portions of webpage content of the associated webpage; receiving, by the annotations repository system from an electronic device associated with a specified author, a request to retrieve an annotations collection from among the maintained plurality of annotations collections, the annotations collection referenced in the received request having been authored by the specified author, and corresponding to a specified webpage being accessed by the electronic device associated with the specified author from a webpage server system different from the annotations repository system, the annotations collection referenced in the received request including one or more annotations relating to corresponding one or more portions of webpage content of the specified webpage; retrieving, by the annotations repository system, the annotations collection referenced in the received request from among the maintained plurality of annotations collections; and transmitting, by the annotations repository system, the retrieved annotations collection to the electronic device to enable the electronic device to concurrently display the transmitted annotations collection and a current instance of the specified webpage, in such a way that the one or more annotations included in the transmitted annotations collection would be overlaid on the corresponding one or more portions of the webpage content of the specified webpage.
41. The method of claim 40 , further comprising: receiving, by the annotations repository system from the electronic device, another request to retrieve other annotations collections from among the plurality of annotations collections maintained at the annotations repository system, the other annotations collections having been authored by other annotations collections authors and corresponding to the specified webpage; retrieving the other annotations collections referenced in the other request; and transmitting the retrieved other annotations collections to the electronic device to enable the electronic device to concurrently display the transmitted other annotations collections, the previously transmitted annotations collection and the current instance of the specified webpage.