[kijin]

The process of logging in with a third-party account takes about as much time as filling out a name, email address and a password into a form. Since I can even get my browser to auto-fill my name and email address and auto-generate a random password, creating "yet another account" (a couple of clicks, no typing at all) is actually less hassle for me than logging in with some other account and then going through a scary-looking authorization prompt. In fact, apart from Stack Overflow, I can't remember a single website where my identity is tied to another account of mine.

[orillian]

And to make things worse a lot of time after you go through the facebook/google/github login they still require you to pick a password for their service, which means the login was purely to get you to link your accounts to their services which just feels icky to me.

Sure support it as an option, but don't make it mandatory that you have a account with social media service X.