the list of somehow inactive feeds.
The top 3 reasons why those feeds may be inactive are:
- the blog doesn't exist anymore (404)
- the blog changed it's engine and the feed url is not the same (for ex: the blog moved from jroller to wordpress, it is hosted somewhere else...)
- there hasn't been any post for a really long time
- Try to avoid at all cost changing the feed url
- When it's not possible write a last post saying the url is changing before changing it otherwise nobody will notice it and therefor you are loosing all your readers