I could give you the Dictionary.com definition that I planned on put here but instead, a filter bubble is basically a bubble that follows you around while your on the internet. As you search, for example, Henrik Lundqvist, he gets pulled into your bubble. A algorithm sees Lundqvist in your bubble, and begins to selectively guess that you are looking up New York Rangers, Henrik Lundqvist, or goalie once you type the letter L into google. Basically the algorithm or bubble takes everything you do on the internet and continuously alters your bubble. You see what your bubble wants you to see, therefore influencing your bubble in a continuous circle which is hard to get out of as the algorithm separates opposite viewpoints. This is where filter bubbles