Google is going to close Google Plus on April 2, 2019. So every google account user received an email for this.
And the Blogger platform users also see a notification that a number of change will be made to Blogger's Google+ integration on 4th February, 2019.
Google+ widgets, +1 Button, Google followers button and Google Badge widgets will no longer available now.
+1 Buttons/ G+ buttons and Google+ share links below blog posts and in the navigation bar will be removed.
Google+ Comments will be turned down and all blogs that uses Google plus comments will be reverted back to using Blogger comments. But Google plus comments posted as Google+ comments can not be migrated and will not appear on your blog.
And the Blogger platform users also see a notification that a number of change will be made to Blogger's Google+ integration on 4th February, 2019.
Google+ widgets, +1 Button, Google followers button and Google Badge widgets will no longer available now.
+1 Buttons/ G+ buttons and Google+ share links below blog posts and in the navigation bar will be removed.
Google+ Comments will be turned down and all blogs that uses Google plus comments will be reverted back to using Blogger comments. But Google plus comments posted as Google+ comments can not be migrated and will not appear on your blog.
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.