Social sign-in or log-on is a Customer Identity and Access Management techniques enables website visitors or app users to sign-up or sign-in more rapidly to a website since they don’t need to enter their email address and password. Instead they enter their Facebook, Google or LinkedIn details for authentication via APIs.
Social sign-in can be setup directly via APIs with the platform providers or via dedicated services including:
Conversion XL have an interesting summary with anecdotes about the impact of social sign-on.
Mailchimp, a B2B email marketing platform, recorded a 66% drop in failed logins after introducing social login. Impressive, but since only 3.4% of their users signed in using social login, they decided to tweak their traditional registration form and remove their social login buttons.