The app said that it works with third-party service providers and "other Facebook Companies" to help it operate, provide, improve, understand, customize, support, and market its services.
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It mentioned "These companies may provide us with information about you in certain circumstances; for example, app stores may provide us with reports to help us diagnose and fix service issues".
In its updated policy, the company said that if "you use our Services with such third-party services or Facebook Company Products, we may receive information about you from them. For example, if you use the WhatsApp share button on a news service to share a news article with your WhatsApp contacts, groups, or broadcast lists on our Services, or if you choose to access our Services through a mobile carrier's or device provider's promotion of our Services,"
WhatsApp informed that as part of the Facebook Companies, it can make suggestions for you (for example, of friends or group connections, or of interesting content), like "personalizing features and content, helping you complete purchases and transactions, and showing relevant offers and ads across the Facebook Company Products," along with "providing integrations which enable you to connect your WhatsApp experiences with other Facebook Company Products".
-PTC News