Following the announcement of Google+ API deprecation scheduled for
March 2019, a number of changes will be made to Blogger’s Google+
integration on 4 February 2019.
Google+ widgets:
Support for the '+1 Button', 'Google+ Followers' and 'Google+ Badge'
widgets in Layout will no longer be available. All instances of these
widgets will be removed from your blog.
+1 buttons: The +1/G+ buttons and Google+ share links below blog posts and in the navigation bar will be removed.
Please note that if you have a custom template that includes Google+
features, you may need to update your template. Please contact your
template supplier for advice.
Google+ Comments:
Support for Google+ comments will be turned down, and all blogs using
Google+ comments will be reverted back to using Blogger comments.
Unfortunately, comments posted as Google+ comments cannot be migrated to
Blogger and will no longer appear on your blog.
Learn more.
Your Google+ account is going away on 2 April 2019. Downloading your Google+ content may take time, so get started before 31 March 2019.