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groups_group_create_complete()
Quick Note on group creation,
When a group first gets created it fires multiple actions some times multiple times.
For example, groups_create_group and groups_created_group fire first on the initial details page, and AGAIN when the group is actually created.
To bind to when the group is ACTUALLY created use groups_group_create_complete.
so:
?1add_action( 'groups_group_create_complete', 'my_function' );