No, really. When I first tried to sign up/log in, it said to use my Yahoo credentials, of which I have none. Do I need to have a Yahoo account to proceed, or can I make my own username and password, and use any email I choose?
I've never used Tumblr. I have no idea if you need Yahoo credentials at all.
I'm not sure why a popular site like Tumblr still uses it. My best guess is that it's an alternative sign-in like how some sites allow you to sign in through Google.
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