To add another example to my own text: Google for something and Google will optimize future results to your known interests. That leads to a filter bubble show

To add another example to my own text: Google for something and Google will optimize future results to your known interests. That leads to a filter bubble showing you more and more customized search results. Are you hurt by this? Not knowingly, but perhaps you miss something important. Do most people know about this? Most likely not, so the collection of data leads to a skewed world view.