me: *signs up for a new blog*
tumblr: account terminated.
me: ???????????? *tries to sign up again using a different email*
tumblr: sorry, that username’s been taken
me:
I have it but you won’t let me in you jerkbutts
You have to wait 24 hours after the name has been changed to be able to take it. When you deactivate an account, the name is accountdeactivated and the original name is on hold for 24 hours.