Janrain has released a study powered by its Engage tool, which analyzed some 365,000 sites. Overall, Janrain found that Facebook accounted for 45% of social logins, while Google came in at 31%. Yahoo and Twitter collectively hold an 18% share of social logins, while LinkedIn, Myspace and a number of other sites account for the remaining 3%. (via Facebook and Google Dominate 76% of Social Logins)
