Confirmation bias is what happens when we seek out information which confirms our beliefs. Now, doing this isn’t always bad, and it doesn’t mean that what you believe is wrong, but if you only seek information that confirms what you already believe, or your biases, you risk having a very lopsided perspective on a number of issues. Worse, it becomes harder for you to think critically about these issues and to change your mind when it would be right or intellectually honest for you to do so.
Exposing yourself to a variety of sources not only gives you a more balanced and complete view of something, but it will also help you better understand your beliefs and defend them more ably. I first learned this in college from Father Schall, who in our political philosophy course would quote Thomas Aquinas (1225-1274): “You don’t really know something until you know the reasons against it.” I’m impressed by that quote.
Now, these insights also apply to our social lives and the people we surround ourselves with, as Clay Johnson writes in his excellent The Information Diet: A Case for Conscious Consumption (O’Reilly, 2012):
“We all live in our own social bubbles, which we create and empower through our social relationships – and interestingly, new research says that these relationships have profound impacts on us. The friends we select, the communities in which we work, play, and love serve as filters for us. It’s too high of a cognitive and ego burden to surround ourselves with people that we disagree with.
“If you’re a Facebook user, try counting up the number of friends you have who share your political beliefs. Unless you’re working hard to do otherwise, it’s likely that you’ve surrounded yourself with people who skew towards your beliefs. Now look beyond political beliefs – how many of your friends share the same economic class as you?” (60)