If you like the original version of Facebook, you will NOT like what I’m about to tell you. Starting Monday, you will no longer have a choice as to how your FB page looks. It is now mandatory to use the new version. Many of us hate change, so this will suck if you really wanted to keep the old version. But remember, Mark is innovative, and will probably continue to make changes over time.
Unfortunately, if you like things to “stay the way they are”, you are out of luck.