Yesterday was a huge day for me. One of the industries I am involved in has had a major brand rank for the #1 position for about 3 years straight and in the top 5 results for the last 6+ years. They are one of the top 50 most popular websites on the internet according to alexa and google trends even lists them a lot. They have about 500k fb likes to give an inidication.
They have finally fallen to #4! Not only that, some video page is ranking #4 and not even their home page.
I will be studying their website to see if anything changed that might have caused their drop. I know it cant be their links.