What do you require of a Facebook Marketer/Manager?

I'm thinking about taking on Facebook clients in the new year after utilising this month to get into the right mindset and work on my knowledge.

At the moment I'm great at growing and monetising audiences, analysing pages/groups, setting up teams, creating organic content, but there's still a lot I don't have much knowledge of yet.

Besides the skills mentioned above, what would you look for when hiring a Facebook Marketer/Manager? I'm not looking for everything, as I am thinking of...

What do you require of a Facebook Marketer/Manager?

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