This guidance from Spain's data protection authority, the Agencia Española de Protección de Datos, gives consumers an overview of the privacy risks involved in logging in to other applications with their social media accounts. It outlines the advantages, as well as the risks, of this practice.
AEPD — Privacy risks when logging in with your social media accounts in other apps

CIPM, CIPP/A, CIPP/C, CIPP/E, CIPP/G, CIPP/US, CIPT
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