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Twitter announced the end of 'free promotion' for certain social media platforms on Sunday. In a series of tweets, the company said users are no longer allowed to promote accounts on Facebook, Instagram, and more. Former Twitter CEO Jack Dorsey asks, "Why?"

In a thread of tweets, Twitter's official support account announced its users are no longer allowed to promote their other social media accounts on the site.

The company said it would be putting an end to "free...

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