Tick the right boxes
This page gives you a Yahoo! ID but it also allows you to decide what extras you may or may not want.
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Yahoo! marketing information: If you do not want to receive any select 'Edit Marketing Preferences' at the bottom of the confirmation page. Then select 'Clear All' to untick all the boxes.
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Email: You can use your normal email address or your new Yahoo! ID on Flickr - just go to the bottom of the confirmation page and click on the button next to the email address that you’d like to use.