A radio show this morning had this same topic, and he concluded that because of social media, we can create our own little world, where we only listen to "our" music, watch "our" tv shows on our own schedule, support "our" causes, and never have to be confronted with other opinions and viewpoints simply by hitting one button.
And you have created your own little cocoon.
As a result, we have lost connections, while supposedly being the most connected.
A suggestion was to invite that couple/friend/family over, that has "defriended you for political reasons" and serve a lovely meal, and talk about...anything!
other than politics. And reconnect to why you were real life friends in the first place!
I like that idea.