I've had this recording sitting around in my YouTube account which illustrates an example of this: CES 2015 which was around the time of the shit show known as Gamergate.
The event aside, it was interesting to understand how sides were inflamed based on what they were seeing thanks to Twitter effectively amplifying similar opinions, creating an echo chamber.
Here's a link to the recording: https://youtu.be/yoCcKYJ7hDI
On the left is an account that was heavily skewed on purpose, towards the more conservative group while on the right is what a regular, unlogged in user would see.
A regular user would have no idea of such an event going on while the user on the left would think that this event was engulfing the planet based on the sheer amount of noise being generated.
For users on the left, it would be near impossible to penetrate the noise, based on retweets and likes, short of a tweet being passed around for users to jeer at. A literal bubble in that sense.
The sad part is that a great number of people from both sides seemingly had a lot in common without realising it. Unfortunately they had no visibility of the "others" short of going out of their way to meet people and talk with them one on one.
As we all know, it's easier to just label a foreign group and pretend we're objectively right.
Anyway, that's just my experience with filter bubbles anyway. Hopefully you found it interesting.