After a long wait, Sedenology — now known as Sedecology — is back!
Sedecology is a social network for typology, where you can type famous people, fictional characters, and people you know, and compare your typings with your friends. It supports Socionics, MBTI, and Enneagram.
The new url is www.sedecology.com, and the code to sign up is ModelACube.
You no longer need to log in with Facebook. (Not only is Facebook sketchy when it comes to privacy, an update on their side broke the log in.) However, it is still strongly recommended to at least provide your forum alias after signing up, so that people can type you.
If you were already a member, you should have received a new username and password via email (at the email you were using for Facebook at the time). Make sure to check your spam inbox, and mark the message as not-spam if necessary.