I'm sorry, but I routinely delete or ignore app requests on Facebook.
If more than 5 app notifications appear in the Live Feed from any friend in one day, I routinely delete them.
See, I was originally "sold" on Facebook because my friends alleged that it was the more mature, not-so-kiddie alternative to MySpace.
Imagine my confusion when I check into Facebook and see adults throwing snowballs, playing Tetris, playing mobsters, or otherwise cluttering up a useful social networking engine....and worse, unlike everything else, the app notifications ("So-and-so just scored X in Tetris!" "Your friend just got 80% on some lame quiz!") CAN'T be filtered out.
So, yeah, I'm a bit underwhelmed at Facebook's maturity.