Its good to have more followers and have less following . Its a trend to follow many people on twitter as possible so that they can follow you and you multiply your followers ! However 20% people on twitter are either spam bots juts tweeting and retweeting affiliate links or dead / fake accounts . While some people simply dont follow others at all ! or unfollow you after you follow them !
Here is top list of Tools to get rid of those Twitter users whom you follow but they do not follow you back !
Happy Un-following !