If you are looking for a way to export Customer accounts created with our facebook login module dedicated for PrestaShop 1.7, 1.6 and 1.5 - this is the article that will help you. To achieve this we will use default prestashop's features - in this case the feature is "Database manager" that is available under "advanced paramters" menu in shop's back office.
Export accounts created with facebook login
SELECT * FROM ps_customer c INNER JOIN ps_fblogin fb ON fb.id_customer = c.id_customer