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The great Instagram purge of the past 24 hours hit Justin Bieber hardest—3.5 million lost followers—but some of social media's biggest brands felt the sting of loss, too.
National Geographic, Nike, Adidas and Forever 21 were among the top 100 Instagram accounts that saw their follower counts pummeled after the spam hunt.
The photo- and video-sharing app said last week that it would cull fake and inactive accounts, and it did its best to prepare brands and fans for the worst.
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