Next, you're asked to choose the Instagram accounts that you want to follow on Threads. Review the list of accounts and tap Follow for any that you wish to include. Naturally, any account you pick would need to join Threads to be available.
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To follow all accounts, tap the button for Follow all. An account that's already active on Threads will display a Following button. An account that hasn't yet joined will display a Cancel button in case you change your mind. When done, tap Next.