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Now after publishing the post on blogger, you will see a dialog box with your post. Here choose the circle you’d like to share the post with and then share it. The post will be added to your Google+ account.
But this feature is only available in the new blogger interface. If you are still using the old blogger, the switch to the new blogger interface by clicking the link at top right corner.
In the new blogger interface, go and integrate your Google+ profile with blogger profile.
Then go to the Posts and Comments” page and enable Google+ sharing.
If you do not want this feature and it is already activated in your account then go and disable it in Posts and Comments page.