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Meta Threads engagement has dropped 50% in a week
(www.nbcnews.com)
This is a most excellent place for technology news and articles.
Google+ had more than one thing wrong with it. Just for example ...
The precursor to Google+ was called Google Buzz, and it was rolled out to Gmail users in a way that exposed privacy & security problems with Gmail contacts. This led to a lawsuit and a settlement which Google had to obey when releasing their next "social media" attempt.
https://en.wikipedia.org/wiki/Google_Buzz#Privacy
As a result, Google+ became a heavy-handed effort that tried to hew closely to the settlement's privacy & consent requirements while assimilating seemingly-unrelated projects such as YouTube comments.
IMHO Google+ had one good thing: Circles. You could define groups of people to share stuff with, without those people having to "join a group".
I don't think people understood it well, though.
Mastodon sort of has this.