iOS 5 makes it even easier to tweet from your iPhone, iPad, or iPod touch. Sign in once in Settings, and suddenly you can tweet directly from Safari, Photos, Camera, YouTube, or Maps. Want to mention or @reply to a friend? Contacts applies your friends’ Twitter usernames and profile pictures. So you can start typing a name and iOS 5 does the rest. You can even add a location to any tweet, no matter which app you’re tweeting from.