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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.
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.
Ginger Harper on top right, you have the icons that can link your posts to most social media in just one click!
Kerrie did a post on this a couple of years ago. I would say 2013, but that is just a guess.
you can share to twitter by clicking on the little twitter logo if that's what you mean, otherwise I'm not sure
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"