[snom380]

Well, it's not only easier, but it's easy to find others that share your (obnoxious or not) opinions in various groups. So now you're in an echo chamber where your opinions will gather likes and reposts, while your friends and family might try to ignore you as best they can.

And of course, the more you associate and interact with groups that fit your opinions and interests, the more Facebook and other ad-supported services will try to prioritize showing you those posts, so the echo chamber effect is amplified.

And when you step out into the real world, you'll be inclined to think of others that don't share your "informed" opinion as uninformed or naive, after all you have seen all this evidence to back you your opinions and theories. [Edit:spelling]