We just replaced the old OpenID login system with a more modern oAuth-based system. We added a few new login options (yay, Facebook and Twitter!) and removed several others. For most people, this will be a seamless transition. You may get a new app authorization screen the first time you log in under the new system, but everything else should be updated automatically.
Most of the deprecated oAuth providers had never been used in our system (anybody ever heard of Vidoop?), but there are a couple dozen people who’ve signed in on one of these old providers.
Specifically, WordPress, Blogger, and LiveJournal each had a handful of users who used on those systems when they created their accounts with us. If you are still part of the Match The Memory, you can log in with one of the more modern providers. We can manually transfer any games and images that you may have created under your old account if you contact us. Just let us know the email addresses of your old account and your new account, and we’ll get things switched over.