More than 1.8 billion people use Facebook groups every month.
Khan replaces Gambia's Fatou Bensouda, who dramatically extended the ICC's reach during her nine-year tenure.
Putin is due to arrive first, then Biden, with Swiss President Guy Parmelin acting as host.
The strikes in Gaza were the first under the new coalition government headed by Naftali Bennett.
Netanyahu made the remark during a meeting he convened as the new leader of opposition.