Almost Yahooed
jeichlersummers.tumblr.com
jeichlersummers.tumblr.com
Although, after reading I did visit Yahoo.com on my iOS device's and I was greeted with a much more pleasant mobile experience than the OP. For example, swiping gestures flicked through headline articles, stationary search bar, and a hamburger menu icon that hid navigation to other areas of Yahoo!.
Maybe it was just the OP's device?
10 minutes later I was still unable to register for an account. No helpful errors, dead-end states. It was as terrible as terrible could be.
Then I tried signing in using my google account. Of course that meant that the login site would crash and would be unusable for the next 5 minutes.
So yeah, not a good first 15 minutes with flickr.
Both correct size and the chrome one also had swipe gestures enabled. http://imgur.com/QYZElnq
Might be based on location (I saw you were accessing from U K).