No you are not paranoid. Facebook really is following your every move. The company admitted on Friday that it is following you when you review news feeds.
Facebook keeps track of how long people look at a news feed, not just whether or not they click on it or like it, to determine its popularity.
In a blog post, Facebook software engineers Ansha Yu and Sami Tas wrote, “The goal of News Feed is to show you the content that matters to you. The actions people take on Facebook—liking, commenting or sharing a post—are historically some of the main factors we’ve considered to determine what to show at the top of your News Feed. But these factors don’t always tell us the whole story of what is most meaningful to you.”
“Recently, as part of our ongoing effort to improve News Feed, we asked people to rate their experience and tell us how we can improve the content they see when they check Facebook.”
So Facebook has learned that just because someone does not like or share a post, it does not mean that they did not like it.