Blogger Google+ comments integration analysis

blogger-google+.md

Blogger account linked with Google+ = Your Blogger account is linked to the respective (your) Google+ profile (both are in the same Google account and if you link them, Blogger automatically uses the Google+ profile in your Google account)

Blogger profile data = display name (changeable), profile photo (changeable, removable), publicly displayed email adress (changeable, hideable), username (unchangeable, the email adress of your Google account, not displayed publicly)

Blogger comment mode = Use Google+ Comments on this blog set to No

Google+ comment mode = Use Google+ Comments on this blog set to Yes

Comment type	General note	Blogger comment mode flags	Google+ comment mode flags	Blogger comment mode notes	Google+ comment mode notes
Blogger comment via Blogger profile	will always show your Blogger profile data from the time of commenting (won't change if you change your Blogger profile data, except if you change your profile photo, it will show an exclamation mark for replacement instead of your old profile photo but the image link still contains the name of the file you uploaded to be your profile photo), will link to your Blogger profile Bug: " " as Blogger profile display name will be displayed as "Anonymous" in Blogger comment mode and "" in Google+ comment mode. Clicking the profile picture would always link to the Blogger profile page.	creatable, viewable	viewable
Blogger comment via Google(+) profile	Blogger profile data will become unused because linked to Google(+)	creatable, viewable	viewable	creatable, viewable, will always show your current profile photo and name fetched/retrieved from Google+ profile, but will link to your Blogger profile	will link to Google+ profile instead of Blogger profile
Anonymous Blogger comment (no data or one-time Name/URL(optional) specification)		creatable, viewable	viewable		get a substitute profile photo (blue silhouette of a generic person)
Google+ comment	Google+ profile necessary, comments won't get deleted in Blogger comment mode because they'll reappear if you switch back, but Blogger only allows Blogger comment mode since Feb 4th 2019	hidden	creatable, viewable

Google sucks at migrating/integrating and maintaining two services together and can't keep them coherent/cohesive... and they're bad at documentations, just take a look at all the confused (partly paying) "consumers" in the support forums!

After Feb 4th 2019

• The comment mode of blogs which had Google+ comment mode enabled was reverted to Blogger comment mode
• Authors of Google+ comments can still see their comments as posts only in their Google+ Activity log. These posts were created at the time of commenting and were the functional scope of the Google+ comment mode. They are special post types with the fixed annotation commented on a post on Blogger.

Google+ comment mode is still available through these URLs (these were the iframe URLs which were logged before the discontinuation of Google+ comment mode):

https://apis.google.com/u/0/_/widget/render/comments?first_party_property=BLOGGER&href=<postURL>
https://apis.google.com/_/widget/render/comments?first_party_property=BLOGGER&href=<postURL>

URLs of the previous comment now return 404s