The redesigned mobile version of the JustUnfollow application for managing a Twitter account has a useful purpose, even if you're not obsessed with Twitter details, Sarah Perez writes. "Within the application, you can view who doesn't follow you back, your fans, those who have both followed and unfollowed you recently, inactive followers, your entire follower base, and more," Perez writes, noting downloads have increased 3 million in the past year to reach the 4 million mark, with more than 30,000 paying for premium services.

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