As a community manager for a social content website, what do you prefer to name elite members ambassadors, moderators or admins?

It depends on the responsibilities of the person.
You may also calle him/her content writer.
Other roles has been defined by Mr.
Mahmoud Hassan Moustafa.

I think Moderators

Hello, I think it depends on the role for each one, If he related to welcome and follow up the members, and has more friendly tasks, i'll name him as Ambassador , if he has a formal tasks like editing posts or reporting i may call him a Moderator, if he has more formal tasks related to technical or functional matters , I may call him Admin.
Regards

Moderator

Well, depending on the website, the website's theme, and the role of those members.

 

Generally, I would go for a catchy and short name, like "Elites". 

It would be benefit for me to know lists of:

1) Moderators

2) Elite member ambassadors