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I checked and this doesn't appear to be something exposed by the Graph API yet (there's page likes and "Fans" related stuff but nothing about page followers). As you are more familiar with the missing item, please visit our page for Facebook Insights metrics missing from Supermetrics to find additional instructions. 

If you manage to find the missing metric or dimension in the API documentation, please post a link to that site in to this ticket. We'll let our development team know of it and they will contact you once it's added to Supermetrics. Please note that fitting the missing metric/dimension to data source connector may take some time. We appreciate your help with this.

-Thank you