The document discusses different types of digital identities and identity providers. It notes that surveys show 66% of users think social sign-in is a desirable alternative to traditional sign-in. It then lists some common identity providers like Google, Facebook, and Twitter and examples of the types of user information they provide beyond basic details like name, email and location. The document advocates that the nature of a user's digital identity matters and that authorization tools should aim to improve rather than impair the user experience.