In my experience, Facebook in 2016 is akin to what AOL was in 1994 - to a large swath of people, Facebook is essentially "the internet" they use. Kind of subscribing to cable TV but only watching one station. It's not too far out of the realm of thought that bubbles exist because people seek them out and like having a bubble (notions of bubbles being good/bad outside the scope of this).

For a while early on, I recall enjoying Facebook when it was .edu email addresses only, because it was a good way to keep tabs on people I went to upper education with and parted ways with shortly after. It was a nice contact resource in that regard. Now the platform is a behemoth, the AOL thing.

Hardly anyone does this, but it's certainly possible to follow a varied set of people on Facebook. Left, right, non-political, religious, irreligious, American, European, Trump-loving, Hillary-venerating, and so on.

Nothing stops a person from creating a set of signals that Facebook will use to generate a mixed content feed that's representative of a broad range of views.

The problem is that almost no one uses Facebook like that.

I had a feeling Trump was going to win due to the viewpoints I was seeing on Facebook... but I trusted the polls, which were in their own bubble that I didn't recognize.