The page I want to open using twitter app:
https://twitter.com/#!/PAGE
To open twitter app I use the following code:
@Alexey: If you just want to know how to launch twitter from your application do this:
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"twitter://"]];
if ([[UIApplication sharedApplication] canOpenURL:urlApp]){
[[UIApplication sharedApplication] openURL:urlApp];
}else{
UIAlertView *appMissingAlertView = [[UIAlertView alloc] initWithTitle:@"Twitter App Not Installed!" message:@"Please install the Twitter App on your iPhone." delegate:nil cancelButtonTitle:nil otherButtonTitles:@"Ok",nil];
[appMissingAlertView show];
[appMissingAlertView release];
}