1. A system, comprising one or more server computers configured to execute instructions that cause the system to perform a method comprising steps of: maintaining particular information; maintaining given information; receiving, over a network from a first user, data that indicates a first specification of interest in being notified about updates to the particular information; receiving, over the network from a second user, data that indicates a second specification of interest in being notified about updates to the particular information; receiving, over the network from the first user, data that indicates a third specification of interest in being notified about updates to the given information; receiving an indication of a given update to the given information; receiving an indication of a particular update to the particular information; receiving, over the network from the first user, a first login request to login to a first application on a first computing device, wherein the first login request uniquely identifies the first user; sending over the network first information and second information to the first application to enable concurrent display of the first information and the second information in a first application display of the first application; wherein the first information is sent to the first application based, at least in part, on the third specification of interest; wherein the first information includes information that provides context of the given update; wherein the second information is sent to the first application based, at least in part, on the first specification of interest; wherein the second information includes information that provides context of the particular update and a particular link that provides access over the network to the particular information; receiving, over the network from the second user, a second login request to login to a second application on a second computing device, wherein the second login request uniquely identifies the second user; without sending the first information to the second application, sending over the network the second information to the second application to enable display of the second information in a second application display of the second application without the first information being displayed in the second application display; wherein the second information is sent to the second application based, at least in part, on the second specification of interest; receiving, over the network from the first application, a first comment, wherein the first comment is entered in a text entry interface, of the first application, that is related to the second information; without the first application having received user input that explicitly indicates with whom to share the first comment, sending, over the network, the first comment to the second application, to enable display of the first comment, in relation to the second information, in the second application; and wherein the step of sending the first comment to the second application is performed based, at least in part, on the second information having been sent to the second application.