In one aspect, a method is provided, including the following method operations: receiving a request to generate a first post data item at a first location; providing for presentation of the first post data item at a second location; receiving a request to generate a second post data item at the second location, the second post data item being in reply to the first post data item; identifying a destination for notification about the second post data item; providing in association with the destination a notification identifying the second post data item, the notification being associated with the first location.