The Filter Bubble is Eli Pariser's theory that personalization on websites and social media we use, creates a filter bubble sending us only information, news and suggestions that confirm our views and likes, and distancing us from other information.
The Filter Bubble: How the New Personalized Web Is Changing What We Read and How We Think, by Eli Pariser
Eli Pariser: Beware online "filter bubbles" TED talk, 2011 (8:57 minutes)
4 ways to burst the ‘filter bubble’ isolating you from different viewpoints
How can Facebook and its users burst the ‘filter bubble’?
How to improve your Facebook feed, so we see the next Trump coming
12 Ways to Break Your Filter Bubble and Gain Diverse Perspectives