Unfortunately, there is currently no way to get the email addresses of each of them in a group (for spam reasons). The closest you can get is the name, Facebook ID, and administrator status by clicking the "/ members" connection of the "Group" object using the Graph API . Unfortunately, now you can get up to 500 group members (again, for spam reasons). If you want, you can submit a function request to Bugzilla explaining your use case, and we can work on figuring out how to expose the data you need, if that makes sense.
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