Formerly known as auto tweets, these are optional posts that are sent out automatically through your Twitter account when new content is published or an event happens on your site, such as a new member join, a content unlock, or a tip.

In your Dashboard's settings page you'll see an integrations section:

This will take you to a connection page:

When you get to the publish step:
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You'll see an optional Auto post. You are free to edit the post or send as is.