Installation
Register an application and use (your server name)/addon/tumblr/callback.php as callback URL
After the registration please enter the values for "Consumer Key" and "Consumer Secret" in the administration.
Notice
This connector is using the Tumblr-OAuth-Library: https://groups.google.com/d/msg/tumblr-api/g6SeIBWvsnE/gnWqT9jFSlEJ