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I'm not from SE Asia, but from Romania. This kind of thing happens everywhere:

-> "Detalii abonament"

-> Social Pass: [...] (Facebook, Facebook Messenger, Instagram, Whatsapp, Pinterest, Twitter, Viber)

It's widespread around the world, except for the US, until recently.

Ah I had never read an article about it, just saw the phone plans and talked to folks when I was there. Minimum googling brought me here - https://www.google.com/amp/s/qz.com/333313/milliions-of-face...

Also available in SA. You have to share your facebook data with the mobile company though.