Try these..... You can use these to mass follow or unfollow. http://refollow.com/refollow/index.html http://friendorfollow.com http://manageflitter.com/ http://tweepi.com/ http://twunfollow.com/ http://iunfollow.com/ http://www.justunfollow.com/ http://www.easyunfollow.com/connect.php
There are still people out there saying if following and unfollowing done correctly, it will work. It may work today or tomorrow, but it probably will eventually get your account banned. They have a large anti spam team and they are improving their system day after day.