EDIT: I misread the OP. I was under the impression that the popup came after clicking "Log in," rather than just being immediately shown on load. Ignore my comment.<p>Personally, I like it, and I think that from the typical user's perspective, it can probably be more convenient.<p>At least, it's more convenient than the classical "click a login link, which takes you to another page, try to remember your password, maybe hit I forgot and have to view your email, and then hope the site takes you back to the page you were originally on" flow. A big win is not having to leave the content you're currently viewing, which is an annoyance on mobile.<p>A lot of the comments on this thread strike me as cynical, and are dismissing the user experience aspect of something like this. Especially considering that the average user doesn't have a password manager (I could be wrong on this claim, I don't have a source ATM).<p>EDIT: I should clarify that I'm talking about the "quick sign in" pattern in general, not necessarily about any specific auth provider.<p>P.S. If you're trying to produce a similar flow on your site, the Credential Manager API (navigator.credentials) allows you save user credentials locally, so when they visit your site, their browser can automatically sign them in.