The flip side is that if you only discuss controversial opinions with people who agree, congrats! You're in the bubble again. Still, whenever I do run across a

The flip side is that if you only discuss controversial opinions with people who agree, congrats! You're in the bubble again. Still, whenever I do run across an online or offline community where people are capable of civil debate and discussion without getting all red-faced, it can be incredibly valuable. It's how I've refined or changed many of my opinions as I got more info and perhaps I've informed the opinions of some other people as well.