Here’s the problem. I go to one of the zillions of sites out there that I use, and it asks me to log in. Now, not only do I have to remember a username / email, a password, but I also have to remember if I used Google, Facebook, OpenId, or whatnot, to get in.
I guess I should set a policy for myself to never use anything other than the built in username/password. That’s probably a better policy for security as well.