Letting users know about changes to the content they are interested in.
A service should be provided that allows users to subscribe to receive notifications of changes to any content that they have an interest in. The service must allow the user to specify existing content (a page, or site section) including user generated content (such as a conversation), or a topic of interest where they will receive notifications of as new content of interest is created.
Not only should users be able to manage all of their subscriptions in a single place, but they should also be able to choose an appropriate method of notification from SMS, email, RSS, Facebook, Twitter and IM.
The Connected City 