Twitter Friend or Follow.com - Remove People That Don't Follow - Linda Randall

I was reading my Tweets and found something about Grammar Girl, so I went to her site.
She did a blog about Twitter Followers, and how it can ruin your bandwidth by having people that don't follow your tweets.

So I went to Friend or Follow. com and found out that I am following 496 people that didn't follow my tweets, so I unfollowed them.  It took me an hour to do, but I feel better, so now I can concentrate on reading my followers tweets and responding to them.