This may not fall into politics for some, but based on the recommendations that I get, it does for me.
Android Chrome for about a year now, and Firefox (for me) since the 57 update, have the default home page giving me "recommendations". Chrome supposedly from my browsing history, and Firefox gives "Pocket recommendations". I have noticed the vast majority of my recommendations are diametrically opposed to my political beliefs.
Chrome is a little better at throwing me a bone with a few Fox News links and then some actual non-political links like Idaho news, outdoor news, tech news, etc. So it does seem to pay attention to some of my interests, but for political interests, it is biased to showing me progressive articles (Slate, Deadspin, etc.).
Firefox, on the other hand, has so far been running 90% left to far left in its highlighted recommendations.
Maybe tinfoily, but I find it all interesting. I'm certainly not opposed to getting "the other side". and will pop into the NYT, etc. for stories, but I kinda like it to be my idea, versus being force fed. I have to wonder if people that use Slate as their main news source get a majority of their browser URL recommendations for Breitbart and Huffpo.