The Filter Bubble: Is It Real? Does It Matter?
Briefly

When search engines yield different results based on who is doing the searching, we face the algorithmically constructed isolation known as the filter bubble.
Pariser pointed to a specific date for the filter bubble's appearance on Google: December 4, 2009, the day Google announced 'Personalized Search for everyone' using cookies to track individuals' behavior across the Web.
Read at Acm
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