Currently, when a user wants to register, we have to ask for both their email and phone number (WhatsApp). As WhatsApp is more personal, and now we have sendemall to broadcast messages, I think we can make the email to be optional and the WhatsApp number compulsory.
We now have two cases for registration:
In the first case, make the email to be optional.
The second case was already handled correctly. From those social media, we acquire their email, then we ask their WhatsApp number after they log in.