This is not possible from the interface as far as I know, but can be done using the API or a rails script.
How many users must you promote to moderators to justify using an automated task? Are you trying to build an army ? 
This is not possible from the interface as far as I know, but can be done using the API or a rails script.
How many users must you promote to moderators to justify using an automated task? Are you trying to build an army ?