A Facebook spokesperson told that the new system is in place to “help us catch suspicious activity at various points of interaction on the site, including creating an account, sending Friend requests, setting up ads payments, and creating or editing ads.”
There is a bug with Facebook's system.
Many report that Facebook has started forcing them to upload a new picture every time they tried to login.
In some instances, waiting 12 hours get the situation back to normal.
Soon, you may be forced to upload a clear photograph of your face onto Facebook to prove you aren’t a Russian bot.