The latter is a valid question. MailChimp had a post about a year ago [1] where they found that social logins had some negative components. Specifically, that t

The latter is a valid question. MailChimp had a post about a year ago [1] where they found that social logins had some negative components. Specifically, that they overall had a lower login rate than the standard username/password. This isn't quite the same, but it IS extra effort for legitimate users to log in. Also, every new login method requires user training. What does the user education process look like if you had to train and support them on (up to) seven different authentication methods? If a user gets used to one of them (say, proximity), how smoothly can you keep them educated that if they are in the subway, GPS won't work, so they need to try /method X/, then /method Y/, etc. That may be worth the effort to some services where security is absolutely paramount; hopefully anyone using this service builds in some heavy analytics to find out! [1] http://blog.mailchimp.com/social-login-buttons-arent-worth-it/ http://blog.mailchimp.com/social-login-buttons-arent-worth-i...