Yahoo - Poor Customer Service & Business Practice
Sign in / Flickr - Complaint
Yahoo took over Flickr quite some time ago now. Fine... but they have arrogantly laid out the new flickr sign in/up with one having sign up to Yahoo just to access the flickr account they have already had and loved for years without Yahoo killing it.
In addition, this new sign in/up process makes it impossible to quickly access your old account, in fact, I have thus far been unsuccessful at opening/signing into my old account at all. And Yahoo help, well is less then helpful, I have emailed them twice asking for a solution, and Nothing!