I believe clearing your buddy list won't do anything, as anyone that has ever been on your buddy list will appear on your news feed.
I strongly dislike it, why should every body know what I'm training. Also I'm getting the reports of all the guys on my buddy list, I'm completely uninterested to see 10 messages of a training update from a different team. I like to see if someone of my opponents makes a transfer, but now those messages are thrown away from the news by 10 training reports