I like the one that Flickr (Yahoo) is now using where you can "log in with Facebook!" only to have it take you to a page where you still must have a Yahoo ID to

I like the one that Flickr (Yahoo) is now using where you can "log in with Facebook!" only to have it take you to a page where you still must have a Yahoo ID to continue. I took some screenshots of the process: http://imgur.com/a/TPdYb http://imgur.com/a/TPdYb Yahoo ID registration requires your DOB, full name, gender (of which only M/F are options), and postal code. Mobile phone / alt e-mail are the only non-required fields in the screenshots I linked.