(JTA) — Just ahead of Chanukah, the Jewish Federation of Broward County in Florida tried to purchase an ad on Facebook, a simple post calling attention to the problem of antisemitism as a part of a new nationwide campaign called “Shine a Light.”

But Facebook’s automated system rejected the ad without explanation, leading federation officials to suspect the post was accidentally ensnared by a filter designed to block hate speech.

“Unfortunately, Facebook inexplicably rejected our ads, presumably because they contained the words ‘hate’ and ‘anti-Semitism,’” wrote the federation’s board chair Ala...