The handshake as a form of greeting in the united states is an example of a:

The handshake as a form of greeting in the United States is an example of a Cultural Symbol. They practice this to express explicit philosophies and communal structures and signify different features of a specific culture. They convey meanings that depend upon a person’s cultural contextual.

now you can mark brain hope this

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.