The problem was more about frequent lack of actual relevance combine with high frequency. For instance, someone could upload 17 screenshots in a simple go to Flickr - all tagged "maemo". How relevant that was for maemo.org/news... not sure but in many cases not much.

I remember now the case with videos. Many times someone would upload a video to YouTube tagged "maemo" and then would publish a blog post with the video embedded, resulting in practical terms in a double entry.