This was a micro-messaging website and XML API. I built the PHP/MySQL back-end, the website front-end, the Objective-C iPhone app and the Adobe AIR desktop application.
You can assign a tag and a name to your message when posting. Then you can filter messages by tag and names. Users can buy names via an authorize.net shopping cart. The XML API has endpoints for sending messages, reading messages, editing messages, deleting messages, getting edit permissions and user login.
The project date is 2007 to 2009. The service is no longer live. Here is a screenshot of the iPhone app: