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 all blogs.
+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 on 4 February 2019. Unfortunately, comments posted as Google+ comments cannot be migrated to Blogger and will no longer appear on your blog.
Google+ Profile: In March 2019, Blogger will revert to only having Blogger profiles. Users that have selected a G+ profile in the past will appear as unknown authors until they next login to Blogger and supply a new display name and avatar.
We are sorry for the inconvenience these changes may cause, but we look forward to delivering fresh functionality to Blogger in the coming year. Thanks for your continued loyalty.
If you have questions about any of these changes or need help navigating them, please visit our Blogger Help Forum.