Does the VK/Facebook/Ok API allow receiving the user's email for internal applications?

Question

PHP

We plan to export a number of games to social media vk/facebook/ok. The question arose of what data we can collect from the user's profile, and most importantly, can we get his mail.
Does anyone have experience with social media APIs for internal applications?
Please share what can be done and how.

Answer 1

in VK, when receiving a token, you can add an email to the scope, to receive an email,
for the user it will look like this (example, do not need to be allowed)
https://oauth.vk.com/authorize?client_id=4790357&s...
and as we see the user may refuse to give it to you.
well, you can get almost all the data that we see on a regular user page.
including the phone number that the user indicated for public display, but the format is arbitrary there, many simply write "cellular", although some users have the correct one.
I don't know about other social media