A July 2012 study by social login platform Janrain, which analyzed more than 365,000 websites that used Janrain’s products, found that Facebook—unsurprisingly—dominated the social login space, and was preferred by 48% of social network login users in Q2 2012. Facebook has exhibited slow and steady growth over the past two years, but has been unable to completely shake Google, which has been used steadily by about 30% of people since Q1 2011. The remainder of social login users were spread thinly among Twitter, Yahoo! and Windows Live. Read the rest at eMarketer.