The Facebook App has it\'s own browser (using the UIWebView for iOS apps) but it has a few limitations. We need certain links on our site to be sure to be viewed with Safari
well iOS uses something called an URL Scheme so you might be able to try to use that. It works with native code...
NSString *stringURL = @"http://fakewebsite.example.com/";
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
not sure if it is possible to do something similar in javascript