“One advantage Facebook has is that we have a principle that you must use your real identity. This means we have a clear notion of what’s an authentic account. This is harder with services like Instagram, WhatsApp, Twitter, YouTube, iMessage, or any other service where you don’t need to provide your real identity. So if the content shared doesn’t violate any policy, which is often the case, and you have no clear notion of what constitutes a fake account, that makes enforcement significantly harder. Fortunately, our systems are shared, so when we find bad actors on Facebook, we can also remove accounts linked to them on Instagram and WhatsApp as well”.