Does Facebook make it harder for people with different political views to get along?
Politics is about making other people do what you think is right. It's just like forcing your religion on someone except that somehow if there's not a God involved it's considered to be morally acceptable. It's the worst form of blind faith in the face of evidence to the contrary, and it's used to justify tyranny. We replaced hereditary tyrants with taking turns being tyrants, instead of replacing tyranny with freedom.
I'm not talking about people defending themselves from others who would wrong them - there's no problem with that. But politics is more than just appointing someone to run a mutual protection arrangement. When two neighbors have differing political signs up, each of them is hoping that his man will win the election and desires that his neighbor be subjugated to the winner.
Given that politics is all about oppressing your neighbor, it's hard to see how anyone could expect to get along over this.