What is the Difference between an Account Owner and a User?

Both account owners and additional users have the ability to create and manage posts, as well as view insights. The account owner, however, is the only one who can manage payment and control adding or removing users.

There is no limit to the amount of account owners or users, it's simply a profile setting. If you need to change this, please just let our Success Team know. 

Should I be an account owner or user? How many account owners can I have? Should I make my team account owners or users?