>I kind of like it, because it's given me a window of "the other side" of my social media bubble. I think the thing Facebook is particularly nefarious at is that, the way the feed works, it makes it seem like of course everyone agrees with you, except that idiot crazy uncle who you eventually have to unfriend, because all you see are seemingly "random" posts that enforce your own viewpoints.
True, though I think the same thing applies to Twitter and YouTube. You see what seems like random things from a huge variety of random people that all happen to affirm your worldview.
I believe Jack Dorsey has mentioned some vague plans to try to address the bubble problem. And I believe I may have been temporarily placed into a YouTube beta test where they tried to include videos unrelated to things I've seen before (I seem to recall an explicit notice about this, and a request for me to give feedback). So, I think they're probably trying, kind of. (I don't use Facebook and never have, so can't comment, there.)
reddit, as far as I know, doesn't do user-specific recommendations in their submission sorting (besides what they choose to be default subreddits), so you have to go out of your way to form a little bubble for yourself. Which many people do, but at least they have some awareness that they're explicitly setting it up to be that way.
That said, especially as of the past 5 or so years, most sites out there have skewed pretty unilaterally right or left, and I believe all or nearly all of the default subreddits currently have a pretty homogeneous political stance. It's not as insidious as the recommendation-based per-user bubble formation other sites have, but it might have a similar effect, especially if someone mostly just looks at their front page and doesn't subscribe to more than a few subreddits besides the defaults.