Facebook Chief Executive Mark Zuckerberg said he supported Muslims in his community and around the world.
Muslims in the United States and abroad have been criticized in the wake of attacks in Paris and San Bernardino, California.
"As a Jew, my parents taught me that we must stand up against attacks on all communities. Even if an attack isn't against you today, in time attacks on freedom for anyone will hurt everyone," Zuckerberg wrote in a Facebook post on Wednesday.
On Tuesday, Republican presidential candidate Donald Trump called for a halt to Muslims entering the US.
There has been a storm of condemnation after Trump called for the ban on Muslims.
