A few days later, Facebook sent us the results of our campaigns. Our three ads reached 5,897 people, generating 101 clicks, and 13 “engagements” — which could be a “like” a “share” or a comment on a post.

Since we contacted Facebook, most of the anti-Semitic categories have disappeared.

Facebook spokesman Joe Osborne said that they didn’t appear to have been widely used. “We have looked at the use of these audiences and campaigns and it’s not common or widespread,” he said.

We looked for analogous advertising categories for other religions, such as “Muslim haters.” Facebook didn’t have them.

Update, Sept. 14, 2017: This story has been updated to include the Facebook spokesman’s name.