We’re used to social networks waiting until the damage has already been done before announcing a cleanup effort. When it comes to the synthetic media known as “deepfakes,” they’ve been notably ahead of the curve. In November, Twitter announced a draft policy on deepfakes and began soliciting public input. And on Monday night, Facebook announced that it would ban certain manipulated photos and videos from the platform. Here’s the blog post from Monika Bickert, Facebook’s vice president of global policy management: