They can't show everything so a filter must be used. They try to show you things similar to what you have liked so you are happy, along with ads related to what

They can't show everything so a filter must be used. They try to show you things similar to what you have liked so you are happy, along with ads related to what you like so you will buy. I can hide/unlike/unfollow things I don't like to tune the filter. How is this complicated? Do people who hate Facebook not understand how to use it? Edit:sp