Problem started two days ago and affected about 70% of our users.
This error is not depends on IP, libraries or server configuration. 

Instagram ignores my requests, Facebook do too.

I've tried to reset client secret, change IP and region, so nothing helped.

Other users reports same problem: <https://news.ycombinator.com/item?id=13178789>

Maybe someone from Instagram/Facebook read StackOverflow and can give some advise or clarify this situation?