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There is a share button but it takes an action on your part. It will not be automatic without you clicking to share.
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When you publish a post, a popup comes up with ways to share - Twitter is one option. The Twitter icon is also at the top right of every post. Finally, you could copy and paste the URL (or short URL) directly into Twitter.
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Ginger Harper on top right, you have the icons that can link your posts to most social media in just one click!
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Kerrie did a post on this a couple of years ago. I would say 2013, but that is just a guess.
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you can share to twitter by clicking on the little twitter logo if that's what you mean, otherwise I'm not sure
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There are buttons that are to the right bottom of your question. There are little icons there. The bright blue one with a bird in it is the Twitter button. Click it, and a window will pop up with this "How can I link my ActiveRain posts to Twitter? http://activerain.com/questions/show/37903/how-can-i-link-my-activerain-posts-to-twitter-#.Vbq5pIi-KYc.twitter"