Understand why it's important to create a Facebook Business Manager. 
Facebook's Manager is an indispensable tool for your business. It has many benefits, including the ability to:
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Manage multiple Facebook accounts and pages from the same platform;
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Authorize different permission levels in accordance with your commercial goals;
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Create customized audiences to segment your ad campaigns;
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Get a clear view of your ad spending;
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Take the first steps toward validating your WhatsApp Business account.
 
To create your Facebook Manager account, click here.
Note: It can take 2-10 days for Facebook to approve your request.