How to get followers settings in facebook

First of all.......

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Login into your account in any browser

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Go to settings and privacy

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Go to privacy settings

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Select "include public as your audience options......" 

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This options will ask to add public as your audience options

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Now come back to settings and privacy 

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You will see the  new option "followers/public post"

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Open it change all options to public......

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Done....!!!!!