I did this, I had ~300 friends and each time I checked Facebook I would unfollow every single person on the feed. Within 3 days I had no more posts and the news feed. I also did this with Reddit. It has slightly helped with "changing the channels" between digg, facebook, reddit and hacker news during finals a few weeks ago but being off for the summer I am reverting back to it and becoming less productive. If other people have this problem I would recommend the chrome extension concentrate.