Social logins from Facebook, Linkedin, and co are often implemented to take out friction in the sign up process. Not as a replacement but as an addition to classic email-and-password-authentications.

Only very few applications build on the existing networks or use any additional services or data the 3rd party platform offers.

Does it really make things easier? 2 issues:

1. People forget with which account they signed up
2. You might assume that people are always logged in to these services, but that’s not the case. Example: when you follow a link in the Linkedin mobile app, and the Linkedin in-app-browsers opens, you are not logged in to Linkedin 🤯

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Be aware that the introduction of 3rd party logins has many downsides and long term implications. It’s also hard to remove them once they are introduced.