consider that after the president of a nation announces a policy position, any politician who challenges that position is harshly criticized, on social media and by the president directly. as a result, nearly all other politicians (especially those belonging to the president's party) profess support of the president, even though some privately have grave reservations. they keep their misgivings to themselves in order to promote an appearance of unity between the president and the rest of the party's leadership. this example best illustrates the concept of: groupthink. a charismatic leader. social facilitation. group polarization.