I purchase the facebook app on my ipod touch and whenever i want to see friends of friends it says error and ive tried purchase it over and over agaim and it still wont work what do i do to fix it

ugh i have this just go to facebook using safari on ur ipod, go to the facebook homepage on ur ipod, then click the little plus sign on the bottom of the screen and click "add to homepage" and just use that. The app sucks.