>"developed anything in messenger even today" I have developed several, your statement is misleading. Messenger user profile API gives, first_name, last_name,

>"developed anything in messenger even today" I have developed several, your statement is misleading. Messenger user profile API gives, first_name, last_name, profile_pic, locale, timezone (non precise), gender, is_payment_enabled, last_ad_referral, Which IMO is much safer than using direct Facebook Graph API. My point being Messenger apps are in-fact better than apps which uses Facebook login when it comes to privacy i.e if you have to use Facebook platform.