How WhatsApp Shares Data with Other Meta Companies:

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This is the most controversial aspect of WhatsApp's policy, particularly since the 2021 update. WhatsApp explicitly states:

Personal Message Content is NOT Shared with Meta for Ads/Product Improvement: WhatsApp maintains that the content of your E2EE personal messages and calls is not shared with Meta for the purpose of Meta's own product improvement, ad targeting on Facebook/Instagram, or for Facebook to suggest friends. This is due to the E2EE.

Metadata and Other Data Sharing for Core Operations and Security: WhatsApp shares other categories of data (metadata, device and connection information, account information, and information you provide to japan phone number list customer support) with other Meta companies for critical functions:
Providing and Operating Services: To leverage Meta's global infrastructure (servers, network, data centers) to deliver WhatsApp's services reliably and efficiently.

Security and Integrity: To help detect and combat harmful conduct, spam, abuse, and illegal activity across Meta's products. This data sharing is crucial for identifying and neutralizing threats that might originate on one Meta platform but impact others.
Measurement and Analytics: To measure the effectiveness and usage of Meta's services, and to provide aggregated reporting.