https://www.theverge.com/2018/11/1/18050362/facebook-political-ads-paid-for-abuse-dark-money

A little form field is giving Facebook a lot of trouble.

We’ve talked in recent weeks about the new “dark money” on Facebook. Earlier this year, the company began to require advertisers to verify their identities, a task they accomplish by typing in a code that they receive via a mailed postcard.