Imagine, you found a nice blog with loads of posts about one of your favourite topics, wordpress. Naturally, you will subscribe to it’s RSS feed. Now, this blog is not just about wordpress. They also publish articles about Linux, Photoshop, and Mac .. which you are not interested in.
After few days or weeks, the blog starts filling your RSS feed reader with posts that you are not interested in and every time you look at the count of unread items on the reader, you feel bad ..