Click to WhatsApp messaging button at the moment are rolling out in Facebook ads
By: Team Ifairer | Posted: 14-12-2017
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For now, Facebook does not have plans to add the WhatsApp button integration to regular consumer services, although you can see the potential for putting the links in, say, Pages where users want to offer a contact address, or in the Marketplace next to items that are being sold, or even in job listings.
source: techcrunch