WhatsApp is a free app, but Facebook still wants to monetize it by introducing advertising.
What is known
The advertisement will appear in “Status”, similar toit works on Instagram Stories. It will take up the entire screen and display the company name. It's currently unclear whether Facebook is going to embed this elsewhere, but we don't want the ads to be too intrusive.
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The company also wants to make in-app purchases easier. The product catalog can be viewed and sent to friends directly on WhatsApp, without going to the browser.
Source: Twitter