How to make a Tumblr account a group blog: 1. Send all the people who you want to join your unique Tumblr account email address (i.e. weird_code@tumblr.com)

How to make a Tumblr account a group blog: 1. Send all the people who you want to join your unique Tumblr account email address (i.e. weird_code@tumblr.com) 2. That's it. :)