Suppose I have a wordpress blog. In every wordpress blog has default RSS feed URL is "yourdomain.com/wp-feed.com". For my affiliate marketing I want to Bum Marketing method. First I have post 10 articles to my blog on a niche. Then for backlinking I did post above RSS feed url to top 50 RSS directory. Again I have post 10 articles to my blog on same niche. Again I have to post above RSS feed URL to top 50 RSS directory or not? Why again I will post same url to to top 50 RSS directory? If I have to post the same url so how much time i have to post the same url?