What's fantastic about this app is that it essentially uses TouchID to quickly authenticate the user before they can post to Twitter. This is a great feature because it does not take long to post to Twitter and it is possible for someone to just grab your phone and post something on your behalf without you knowing it. By the time you find out, it may be too late because all of your followers already read the imposter's post. With this app, you can require the user to log in to be able to post to Twitter. And the beauty is that you can do so quickly with Touch ID.
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