Twitter recently redesigned their sign-up process to boost new user engagement. Though the new sign-up process added one more screen, conversions went up 29%. How? Gradual engagement.

I love this form because it is so straightforward. If you're an existing user, it's only one step to log in. For a new user, the form takes you to a second page that asks you for a little more information and also prepopulates the email you entered.

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