Sheryl Sandberg, COO of Facebook, has pledged a gift of $2.5 million to the Anti-Defamation League in support of ADL’s efforts to combat hate and bias in the United States and Europe. In a post on her personal Facebook page, Sandberg said she was moved to take action after hearing that on Oct. 8 — Yom Kippur, the holiest day of the Jewish calendar — a synagogue in Halle, Germany, was attacked, leaving two non-Jewish people dead and two others wounded. German authorities confirmed the terror incident had an anti-Semitic motive.