This infographic from Gigya - the consumer identity management platform, breaks down how consumers used Social login across the web and mobile devices by industry vertical and region in Q1 2015 (January - March).
According Gigya's study:
"In the first quarter of 2015, Facebook again maintained its steady momentum as an identity provider. With the world's largest social network now approaching two-thirds of all social logins, only Google+ has maintained a sizable share of logins among other identity providers. Yahoo, having dropped to 5 percent of logins, was surpassed by Twitter for the first time, and has all but disappeared as an identity provider."
For more detail on social login preferences across the world, take a peek at this graphic.