Community admins can enable social login options, such as Google, Facebook, LinkedIn, Twitter, and Slack for their Tribe communities.
But first, you need to install the Social Login app from the Admin Panel> App section. How to install an app to my tribe community?180
When the app is installed, click on the "Social Login" app under the App Settings in your admin panel:

Pick the social login options you want to be added to the community registration page, then fill out the setting sections for each, then update the changes.
How to activate Google Social Login50
How to activate Facebook Social Login45
How to activate LinkedIn Social Login23
How to activate Twitter Social Login19
How to activate Slack Social Login2
Still have a question about the Social Login app? Please check this Q&A page16.