While some say that facial expressions are identical, meaning attached to them differs. Majority opinion is that these do have similar meanings world-wide with respect to smiling, crying, or showing anger, sorrow, or disgust. However, the intensity varies from culture to culture. Some see animated expressions as a sign of a lack of control. Too much smiling is viewed in as a sign of shallowness.
Women smile more than men.
But within USA, African-Americans use more eye contact when talking and less when listening with reverse true for Anglo Americans. A prolonged gaze is often seen as a sign of sexual interest. Arabic cultures make prolonged eye-contact. Japan, Africa, Latin American, Caribbean avoid eye contact to show respect. An African-American male goes into a convenience store recently taken over by new Korean immigrants.