A filter bubble is a state of intellectual isolation that can result from personalized searches when a website algorithm selectively guesses what information a user would like to see based on information about the user, such as location, past click-behavior and search history. Bozdag, Engin (23 June 2013). "Bias in algorithmic filtering and personalization." Ethics and Information Technology. 15 (3): 209–227.
Say whaatt?! Basically, the filter bubble is the idea that internet companies are constantly tailoring content for you based upon your past internet interactions. It's the reason your search results likely differ from your friends, family and classmates. This may be fine for everyday searches (more on that later), but could have serious repercussions when it comes to researching for an assignment.