As you may know, we have a river of news for some of the occupations around the world. The goal is to complete the list and keep it current. So, as new cities come on, their feeds show up in the list, and we're showing their news on the news page.

Of course all this data is open and available to other developers to build on.

Here are the two key bits:

1. The OPML subscription list. You can import this into any news reader that supports OPML, which should be all of them. It's the standard way of exchanging subscription lists. If your reader does not support dynamic lists, you'll have to re-import it from time to time, as the list grows.

2. The JSON news flow. This is the aggregated news flow in JSON format. It's what the River page displays. Poll it at most once every ten minutes, that's how often it's updated. At the top of each hour and 10, 20, 30, 40 and 50 minutes into each hour. I think the format is fairly self-explanatory.

Both of these files are hosted on S3 so they should be able to handle some traffic.