Methods and apparatus are disclosed for notifying one or more users of information. One or more users are identified that have entered a subscription that matches the information; and a communication flow expression is generated that contains at least one primitive keyword indicating how a notification to the identified users should be processed. The communication flow expression may be provided, for example, to a third party for delivery. Typically, a request identifier is received back from the third party and forwarded to the application associated with the information. The communication flow expression comprises at least one recipient for the notification. The identified users may be required to have appropriate privileges associated with the information before being added to the communication flow expression.