Maybe you noticed or not. But if no, I can tell you that the things that you search or want to see on Facebook or Google, Yahoo News and not only, are not always the things that you wanted to be. I know it sounds a little strange but, you really never seen things just disappearing from your Facebook timeline?
Or, did you know that if in the same time if I search for something and you search for same thing on Google in exactly same time even, we get very different search results?
There is no standard Google any more. There are 57 signals that Google looks at, everything from like what kind of computer you are on, what kind of browser, what location and so on before to show you the search results. See more for video.
The hard part is that you can't see how different your search results are from everyone else. Better let's watch the video explication.