Pretty self-explanatory if you are using or have used Twitter. I will list the different user roles and what each role can do.

Owner (I have set it so that the role of the user with id of 1 is automatically set to owner):

username: owner, password: owner

• Add tweets.
• Remove their own tweets individually.
• Remove other people's tweets individually.
• Promote user to admin.
• Demote admin to user.
• Remove users (including admins) individually (in the Admin Panel).
• Remove all tweets (in the Owner Panel).
• Remove all users (except themselves) (in the Owner Panel).

Admin:

username: admin, password: admin

• Add tweets.
• Remove their own tweets individually.
• Remove other people's tweets (except other admins' and the owner's) individually.
• Promote user to admin.
• Remove users (except other admins and the owner) individually (in the Admin Panel).

User:

• Add tweets.
• Remove their own tweets individually.

Now, I will list what none of the roles can do.

• Follow other users.
• Favorite and retweet.
• Change password.
• etc.