, twitter , , :
if([TWTweetComposeViewController canSendTweet]){
...
}else{
NSString *tweet = [NSString stringWithFormat:@"http://twitter.com/intent/tweet?source=SourceApp&text=%@", [tweetText substringToIndex:140]];
tweet = [tweet stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *webLink = [NSURL URLWithString:tweet];
[[UIApplication sharedApplication] openURL:webLink];
}