Audience: The number of total Page likes.

New Fans: The number of new Page likes received during the selected time period. 

Lost Fans: The number of Page likes lost during the selected time period. 

Organic: Page likes received from organic sources.

Paid: Page likes received from a Sponsored Story or Ad pointing to your Page.

For more information on Facebook metrics, please refer to the following FB developer resource: https://developers.facebook.com/docs/graph-api/reference/v2.8/insights

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