Voicebook is not working, please help!

Hi folks. I have tried to instal Voicebook on Iphone 4 , but I keep getting a kind of error. When I launch Voicebook I get the notification in a way that the app is designed for voiceover users when I click OK button Safari will just open, I am stuck at 80% of opening the facebook website or so and I cannot get any further. I am sure my internet connection is good because I do not have a problem with any other apps. Another thing I would like to ask how much is Voicebook? Thank you in advance for your help.