Don't forget the disinformation which is the result of the echo chamber. If my Facebook feed is to be believed, not only will everyone be voting for the same party as myself, but they all hate the other party, who are indeed all devils.
I think the idea of echo chambers and the link to disinformation is interesting. I found myself thinking that a certain viewpoint is the norm in many areas of life, whether it be work, reddit or hobbies.
You only have two parties to choose from? There's 5 where I'm standing