While you may enjoy signing into a new app or service using your Facebook profile, many people either don’t have — or want — to sign up for Facebook. For them, Facebook is introducing Account Kit, which lets users sign in with just a phone number or email. Already the world’s number one sign-in product, Facebook is launching Account Kit to help developers with the sometimes tedious on-boarding process. Early launch partner Saavn, a streaming music service in India, reported over half a million new signups in its first month with Account Kit — a 33 percent increase in total…

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