If you're running iOS 7 on your iPhone or iPad, Siri makes it easier than ever to post a tweet to your Twitter timeline without having to tap a single key on the keyboard. This makes for a great trick when you're wearing gloves or doing something where you can't completely concentrate on typing. Here's how to do it:
That's all there is to it. Siri will send your tweet on its way. As a side note, if Siri produces an error or tells you to link your Twitter accounts, make sure you're signed into your Twitter account in the Settings app.