Ariana Tobin is an engagement editor and reporter at ProPublica, where she works to cultivate communities to inform coverage.
Dozens of hateful posts in a secret Facebook group for current and former Border Patrol agents raise questions about how well if at all the company is policing disturbing postings and comments made outside of public view.
The dispute between HUD and Facebook over how advertisers target ads looks to be coming to a head. How did we get here?