Google: the broad default
Google is a practical first choice for general consumer products, education tools and many workplace apps. Users recognize it quickly and often already have an active browser session.
It is usually the highest-coverage single button, but it should not be your only option when your audience includes Apple-first consumers, Microsoft-heavy organizations or developers.
Apple: important for Apple audiences
Sign in with Apple is especially relevant for iOS and macOS products. Apple’s token exchange differs from static-secret providers: the client secret is a short-lived signed JWT generated from Apple team and key credentials.
Apple users may choose a relay address, so your user model should treat the returned address as the stable login identifier and avoid assumptions based on its domain.
Microsoft: work and school accounts
Microsoft login is a natural fit for B2B software, internal tools and education. A common Microsoft endpoint can serve personal and organizational accounts, depending on the provider application configuration.
If a customer needs enterprise federation, provisioning or organization policy, social login alone may not be enough. That is where custom OpenID Connect or a larger identity product becomes relevant.
GitHub: developer products
GitHub is often the most natural primary option for developer tools, infrastructure products and open-source communities. Its API may return multiple addresses, so an integration needs to select a primary account email consistently.
Offer GitHub because it matches the audience, not because it is fashionable. A consumer app may gain little from the extra button.
LinkedIn and Facebook: audience-dependent
LinkedIn can fit recruiting, professional networking and B2B communities. Facebook can still be useful for products whose audience already uses it as a consumer identity. Their value depends more heavily on geography and customer profile than a generic ranking can show.
Measure button use after launch. A provider that contributes almost no successful logins adds visual choice and maintenance without meaningful coverage.
A sensible launch set
For a broad web application, begin with Google plus the provider most specific to your audience: Apple for an Apple-heavy consumer product, Microsoft for workplace software or GitHub for a developer tool. Add more when support requests or login data justify them.
Login Broker exposes all six providers through the same initiation and verification shape, so expanding the set does not require a new application-side protocol for each provider.