Social Login Preferences, Q2 2011-Q4 2013 [TABLE]
Q4 2013 research by Janrain painted a similar picture, though it looked at slightly different social networks. The analysis found that 45.1% of social networkers worldwide entered their Facebook IDs when using social sign-in—the highest percentage. With the exception of second-place Google (35.4%), Facebook ruled the rankings. Read the rest at eMarketer.