Social Sign ins help users to sign in to a 3rd party website using their existing social media or email logins. With the growth of internet & social media/networking, registration required for all the sites is a tedious process. It takes a lot of time & also to have different user name/logins. In such a case, social sign ins come into picture. Facebook is the top such log in used at 45% followed by Google at 33%. Other companies, like Microsoft, yahoo, linkedin, twitter account for just above 20 percent of social sign ins. Both Google & Facebook account for around 78% of such social logins.
You will find more statistics at Statista