LinkedIn does not have a simple proxy provider. The current Firbase basic login providers are:
- Facebook
- Twitter
- Github
- A person
- Email / Password
Firebase integrates with Singly , which has LinkedIn and dozens of other vendors. You might want to explore their services. However, they seem to be turning to the health service instead of the OAuth integration platform, so you can think about your future before committing.
Also see Andrew Lee's comment on this answer; A user login is a great way if you are looking specifically for LinkedIn.
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