Party Affiliation Bubble [...]

Filter Bubbles exist offline as well.

A bubble envelops people by party affiliation as well. Among Democrats, almost 34 percent say all of their closest friends are Democrats, while only 7 percent of Democrats that say that none of their closest friends are Democrats. With Republicans, 28 percent say all of their friends are Republican.

It should come as no surprise that Americans who tend to spend time with one another share the same views. Almost six in 10 people who disapprove of Barack Obama’s job performance as president say all five of their closest friends disapprove as well. Asked about the Affordable Care Act, 43 percent of those who oppose it say all five of their closest friends also oppose it. And 39 percent who support the health law say none of their five closest friends oppose it.

We see a sharper divide with abortion: 56 percent who oppose more restrictions on abortion say their friends feel the same way, and 39 percent who support more restrictions on abortion say all five of their closest friends support such restrictions. (Source)