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How did the groups made Google Plus worse? I stopped using Plus mostly because my friends weren't there. Also I didn't like the UI.

In Facebook groups are one of the best features. It's easy to find like-minded people and discuss stuff that I really care about.

And a question for you too: If you don't like groups, how would you solve the "too much noise" problem? Users are already seeing too many posts so that many good ones will be forgotten immediately, or even not seen at all. Good writers don't get the attention they deserve. It discourages new users because they can't get any followers. Without groups, it will be very hard to get any upvotes or comments in the future because there is just too much content.

I've never been on g+ and fedbook carded me in '12, then locked me out of my account of 7 years, soooo, they can jump in a lake, afaic. http://facebook.com/proclaimation

I don't see any problem with 'noise'.
You get to build your first group by subscribing.
Do you subscribe too many authors you don't like?

Hashtags are groups, did you not find yours?

Groups are going to happen, it is just a damn shame in my book, those people will never have a chance to stumble upon the message that could solve their most pressing issues because they would rather escape into cat videos and forget for a little while that their apathy is murdering children worldwide.