It seems Twitter has strong armed Dossy's Twitter Karma and Huitter's Mutuality service out of providing the bulk unfollow function on Twitter. It was very useful for those trying to grow their Twitter following. You could bulk unfollow those who were not following you and fill those available slots with new followings hoping that some of them would follow you in return. This follow – wait a few days – bulk unfollow and then rinse and repeat worked very well for growing your Twitter following.
Well Twitter didn't like that and seems to have succeeded in blocking these two popular services from bulk unfollowing. So what do you do now. Our preference is using services like TweetSpinner. While not free, they do allow you to unfollow in an automated fashion on a regularly scheduled basis. They don't mass unfollow in one stroke but do so a few at a time all day long. This keeps Twitter at bay and also helps you grow your account. In addition to the bulk unfollow function, TweetSpinner also provides filtered following, smart tweets, scheduled tweets, rotating profiles and automated DirectMessages. Well worth the nominal monthly fee.
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