A painful reminder that you can never get too comfortable or take for granted any social network feature you may have grown accustomed to and / or rely on.
Such changes are generally driven by potential for increased profits, dissatisfaction with being just a simple and reliable social network or expressing a sadistic tendency by allowing you "friends" and employers to easily access anything and everything about your past that you hoped remained buried very far down your wall.
Facebook timeline is an excellent example of Zuckerberg rape.
So I clicked the "learn more" button and now I'm stuck with facebook timeline!
You also got force upgraded by the new gmail? You totally got facebook timlined.