DO YOU KNOW how hard it is to integrate custom code into a Facebook page? VERY. Particularly if you're sort of making up/Googling the code as you go along. Which, most of the time, I am/do. But pretty well, I must say.
Working to customize Facebook is like that rule with chefs: you know that they're leaving at least one ingredient out if they agree to tell you a recipe--the most important one, usually. Yeah. That's what Facebook's instructions are like for coding on their platform.
But, just to prove that stubbornness and several sleeves of Ritz crackers will get you just about anywhere, behold. My custom Exclusive Excerpt tab for THE MARIA PARADOX. http://on.fb.me/wKPrOO