[Liquid_Fire]

No, this is Google providing authentication with your Google account to third-party websites. If you are already logged into a Google account, it suggests that you log in with that account with a popup saying "Continue as <your name>" and shows your email and avatar.

It's an iframe so the website itself doesn't have access to your data, but this is not obvious just from looking at it - it looks like part of the site. To me it feels like it teaches users to trust websites in ways that make them susceptible to phishing.

[jtsiskin]

Yeah, that’s why I dislike it as well. Imagine the same “sign in with google popup” but it’s just a floated div on the page. A user who uses the “continue as button” might be comfortable typing their password in there, thinking it’s part of the browser

[notRobot]

Ah, I didn't know that it's an iframe and I'm always a bit creeped out by it (it really isn't obvious!). Thanks!