Tumblr's Twitter integration can be a little confusing — all you have to do to set it up is to authorize the Twitter widget through your Blog Settings page. You can get to the settings page by clicking the gear icon at the top of your dashboard, then selecting your blog from the right-hand sidebar. Click 'Share on Twitter' and sign-in if necessary to authorize the app. You will then see an option to share your Tumblr posts on Twitter, if you'd like to do that. Once Twitter is authorized, your widget should work!
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