I'd like to see some stats on Facebook login vs. Google login usage. I suspect Facebook login is used more often than Google, and now Yahoo! is trying to be another also-ran in this field.<p>The thing is, people want the simplicity of sign-in, and I don't know that Yahoo! services are compelling enough at this point. Their are too many other competitors, all likely using Facebook or Google, and Facebook pretty much has the social aspect of these services locked up. How many of us have as many social connections on Google+ as we have on FB?