в iOs 5 это очень просто.
сначала добавьте в твиттер фреймворк der Build Phases / Link Binary With Libraries
![Build Phases / Link Binary With Libraries](https://i.stack.imgur.com/cT3tp.png)
- (IBAction)yourTweetUIButtonAction:(id)sender {
if ([TWTweetComposeViewController canSendTweet]) {
TWTweetComposeViewController *tweet =
[[TWTweetComposeViewController alloc] init];
[tweet setInitialText:yourUILabel.text];
[self presentModalViewController:tweet animated:YES];
} else {
//can't tweet!
}
...